Passive-aggression isn't going to make anyone help you, man.
I don't have a schematic, no. If he hasn't blown the digital chip, regulators and suicide diodes are the main candidates for failure. You'd need to take voltages on those components with a multimeter. The diode would probably be a big black cylinder and the regulator would be in a standard transistor packaging or possibly one of those bigger ones with a metal heatsink with a hole in it (unlikely).
I'm assuming this isn't the nano version. If it is, you're just going to have to send it off to EHX. I wouldn't know where to start finding the reverse polarity diode or regulators in the SMD version.
