Rockford Fosgate Punch 400.4

This amp has a few issues with it..

The left rear channel plays clean audio

The right rear channel plays clean audio but is very low output

Both these channels play but the outputs and mesha board get to hot to touch after a min ..

Any ideas on what to check ?

The front left channel plays clean audio

Right front channel has no output

Since both right channels have no audio or low audio im assuming this may be a dirty switch

Wondering why he rear channels all the outputs and mesha board get vry hot after a min