I recapped that monitor and I now have the dreaded vertical collapse problem.
So far I have checked all the caps, fixed one bad solder issue (which is likely the culprit), replaced TR402, TR403, replaced the IC LA1464, and replaced a bad resistor at R216 which looked like it exploded.
I'm looking closely at the schematic that controls vertical and have a bunch of things to still check. Looksl like R414 is interesting one to look at next. Any other ideas?