A few things:
If this game is a keeper, you really should have gotten a cap kit from iankellog, security001, or Buffet here on the forums. They all sell cap kits with high quality caps.
Bob's cap kits will work, but you might be doing the job in another 1-4 years where using one of the ones recommended above, you may never have to change the caps again, or at least not for a very long time.
As for the amp board, beware ! this is unlike other amsp, and it runs on a higher voltage than you'd expect (from the monitor electronics), and will be unpleasant if you introduce yourself to personally to it .....
Also.... and this is a BIG (WARNING) NOTE...... you can reverse two connectors on that amp board. DON"T (let me repeat it.... DON'T!) get them wrong ! You will not like the result, as you'll have released the magic smoke from parts on your DKJR PCB. Please don't ask me how I know this
The monitor is most likely a Sanyo 20EZ. I think they are actually pretty nice monitors myself. As your monitor appears to generally be working, at this point only replace caps. Don't replace transistors/etc (shotgun approach), as sometimes the new parts aren't as good as the old (lots of Chinese vendors remarking parts... looks like I'm holding the bag on some "AD561J" I purchased (I haven't tested them all, but I tried a pair on Star Trek... don't ask me what those chips are.... but they aren't AD561J despite what is printed on them....)
And lastly, if you haven't done a cap kit before....
1. take your time
2. do one cap at a time
3. note the polarity of the cap you remove, re-install the same way
4. If you doubt the old one was in right, check any info with the cap kit (if present), check the original manual, and schematics (but do note sometimes the manufacturers got stuff wrong). Sometimes the cap will be in right and the screening on the PCB is wrong too....
You'll save yourself a lot of heartache if you follow those simple steps....
There are some good monitor guru's on the forum.... so if you run into trouble, post what is going on and you should get some good advice.