Orion PBW 2018 color issue

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Hey all,

I've got an oddball Orion PBW 2018 in my WWF Superstars cab. For a while it's been running good other than some minor interference of some kind on the screen. Recently the picture lost blue and I pulled the chassis and did the usual dance of touching up solder anywhere I could see possible problems and especially any video headers and adjustment pots. I also tried to hook it up to my rejuvenator, but I wasn't even able to get the heater to fire up. I should note I just made a universal adapter today from some Rat Shack mini-clip jumpers, but I triple checked all the connections. I'm wondering if the wire on those is just too small to handle any kind of voltage. Anyway, after that I put the monitor on the bench and went over it again. I fired it up and then I had a horribly blue picture like what you see here. It went away and now it's come back again so I put the monitor back in the cab and called it a day. I've never seen a schematic for this thing so hopefully someone here can offer some advice. I'm thinking maybe I will change out all the pots since a few of them seem are really tough to turn. The blue pots don't seem to be having any effect. I may end up just getting a chassis for a spare K7000 tube I have and running that in there, but maybe I can get this thing going. Here's the fugly pic I'm getting on this thing right now. Notice how blue it is and the wrestling ring should be a blue shade but it's green! It's like the blue is only on the outside area of the image :(

Edit: Forgot to mentioned that I've already pulled and tested both blue color transistors on the neckboard.
DSCN0619.jpg
 
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Update: I thought I had it figured out as a bad blue cutoff pot. It would go from now blue to full of blue when I turned that pot. After taking it out of circuit and testing it anyway, I found it was good. Both the blue cutoff and drive pots make a difference in the blue there's still too much.
 
I fully capped out the chassis tonight with no change. You could tell it had been capped before, but a few of the caps were bulging already. I figured if I'm going to be a bit stubborn with this monitor, I might as well do a full recap to eliminate that. I also forgot to mention I have swapped in another board to verify it's not a board issue. I plan to take a look at the neckboard and specifically the drive transistors again this weekend. I'm wondering if it still might be the tube, but if I could narrow it down to a tube or chassis issue I'd be a lot happier. The biggest challenge with this oddball monitor is I have no schematic or extra chassis to swap out. :(
 
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Ok so apparently I wasn't thorough enough in checking the pots early on. It ended up being a broken/flaky blue gain pot that was causing the issue. I spent way more time than I wanted to checking and re-checking transistors among other things, but oh well at least it's fixed. This is unfortunately the 2nd time a blue adjustment pot had me chasing my tail trying to fix a monitor. You'd think I would have learned the first time haha. Now that it's been fully recapped and has blue working again, the picture looks phenominal. I did end up getting a #25 adaptor for the tube from some company out East, but looks like I won't need it for now. The only other nagging issue with this monitor is it has some kind of interference lines in the picture. The lines will move left to right and change speed at times too. The ground to the monitor frame makes no difference either way and neither does the marquee light. One thing I would like to do yet is un-hack the video wiring that was messed with when someone put this monitor in the game. They used those self stripping wire splices and bypassed the original molex connector. At least fixing that would eliminate that as a cause for the interference.
 
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