Have you tried contacting kicker about this?
chances are, If they wont give you any details, thens it's probably a company secret, so it would be near impossible for someone else to have this info.
I've no idea what the circuit is like, but this kind of fault usually means the output devices (either transistor, MOSFET, or IC) are blown. It could also have been caused by something else, so it's usually wise to replace at least the drivers as well.
For a start I would contact the manufacturers and see if they will supply you a service manual.