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Atleast the A4 diodes are not too bad to replace. Worst part is the lacquer coating (or whatever it is) Might as well do that large resistor on there was well. They burn up often

The voltage adjustment could be bad as well. Swap the VR board out as a test. Make sure jumpers are set correct on the terminal board.

There was a good discussion about field flashing a few weeks ago on here. Different problem IIRC, but it should get you going in the right direction. Take a look at that bridge rectifier board inside the back bottom of the ac re-connection box.