I have this U5000 that I use with my supergun (JAMMA tester) that I had rejuvenated for a weak red. now I saw it with my own two eyes that the red gun was weak, but after the rejuve when I powered it up, the red was still weak. upon extremely close inspection of the traces on the red transistor, it didn't look it at all, but I checked all the points for continuity and one of the legs didn't check. I don't know how I could still have faint red despite one of those legs showing dead, but nonetheless, I got out some wire and cut the old traces and redid them all.
after a healthy dose of white balance, I got a pretty decent working monitor out of the deal. my only regret is using 22 gauge wire to do the patchwork, 30 gauge would've looked way nicer.