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There are some small differences between the 72-5020 board and the 72-5338 board, but it's things like resistor power ratings which don't really change anything operationally. Those numbers are silk screened onto the boards.

Ike, the parts manual that I have for the 002A lists 72-5020 and 72-5338 as the two AC regulators that were used. Both are configurable with jumpers for 60 Hz and 400 Hz. These are the same as the ones used in the 003A. Were there others?

No doubt that if you want an exact replacement you need to check the dimensions. But if you're a little handy, you can drill new holes in the board and solder in a pot of different dimensions. That's what I did to repair one original regulator I worked on. If you do it right, the now holes...

Good clue here. Since the range of the front panel pot changes during the problem, it would seem the pot itself is not causing it. The suggestion of cleaning the voltage adjust pot on the regulator board is a good one. Maybe just replace it. Have you tried tapping on various components of...