Since I am not there to actually trace out each wire connection to the battery charger PC board, I can’t tell by looking at your photos which are power input wires and which are power output wires to the board. On one of the manual pages it references sending in the board for factory repair at $22.00 plus return freight charges. Since this manual is rather dated, I would contact Progressive Dynamics to see if they still repair this board or have replacements and the current costs.
It appears that the board can be removed by unplugging the 6-pin connector and removing a couple of mounting screws.
