I'd recommend creating your own thread for this. I assume it worked and then quit working. The OEM LEDs aren't really designed to be serviceable. Presumably it all runs on twelve volt which does mean it should be easy to test for wiring shorts; once you map out the wires. You can also use resistance tests on the volt meter to compare the working side, to the non-working side. LEDs, unless they're being run too hot or overloaded, generally don't fail. So I doubt that they're gone; more especially since you lost multiple all at once. If it's not the wiring then it's the controller. Controllers in general often suffer from poor solder joints on the PCB. Either way you'll likely have to end up splitting the lamp open. Again, recommend starting your own thread.