I finally got some time to dig into the boards. I started off with the boards that were causing an immediate short to the transformer when power was applied. There were 2 of them. Before separating the levels I removed the battery charge capacitor. I then removed the diode that covered where the pins were soldered into the board. After removed I was able to heat each pin and use my solder suction tool to remove all solder and loosen the boards. Note that the removal and connections on the board are very clean. Finally I was able to locate failed diodes on the bottom side of the upper board. Before I go purchasing diodes. Any suggestion on the rating of the diodes and what would cause them to fail? 2 boards same exact issue.