I was soldering some wires inside to tap a line out copy of what goes into the class d amp chips. Without me noticing some of the factory heatsink paste got pushed over the chip pins. Must have been conductive as it fried the chip.
Removed the chip with heat and ordered another incase it's repairable, but will take a month or more to arrive.
I think there may be an i2c or canbus link as the board has an i2c controlled codec and a digital DSP in there. But they may be configured to be automatic I don't know.