Hello SamE30,
From your description it seems likely there is some wiring issue or bad contact somewhere, a FET or IGBT problem seems less likely. As a quick test try and rule that out a rewire is a very good idea; but make sure you use a shielded cable.
MCP chip is not in the rescue kit, exactly when and how did it fail ? If 12v was applied to one of the inputs this might be related to your trigger problem, it can cause additional damage to the ecu.
Best regards, Dave