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"The next problem is that the shutter color changes out of sync back and forth a slow then fast rate till it gets stable after warming up for a while. I did a lot of troubleshooting, changed a bunch of capacitors and transistors and shutter board, but no avail. In the process, I smelled electrolyte evaporating with the flux and I decided to give the board a full wash with dishwasher detergent and waterpik (then dry the big part with a leaf blower, spray with 99% rubbing alcohol to the water out and left it dry). Bingo!"
Didn't see evidence of that. And last year when I tackled this same unit, I re-capped the entire scope.However, there was a coating of dusty crap on top, and some spots on the bottom side where flux and other residue were present.