Rockford Fosgate Power BD1000.1 issues

Rockford Fosgate Power BD1000.1 - works, produces sound but...

There is something like a switching noise at the output speaker terminals (can be heard really well even with a subwoofer mounted in the trunk).

Another concern is Q13, Q14, Q15 and Q16 are getting extremely hot in a very short time. Is that an indication of an issue or it is "factory" like that ? I can replace the heatsinks and use a bigger ones but that would not resolve anything if there is an actual issue.

Any guides ?
 

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