Class D amplifier problem (HK Audio pro 18 subwoofer)

Dear all,

I have an issue with my build in class D amp in a HK Audio Pro 18 subwoofer.

I have 1 in working order, and 1 is faulty.

What happens is the following:

-If you turn it on, it starts to hiss
-if you play music it is significantly less loud then the one that works.
-after 5 minutes, it makes 1 loud pop then makes a very loud screeching sound and then the red light goes to red meaning ERROR.


Does anybody know what I could do or check to see if some components are broken! I personally think it is the power module or a MOSFET?
 

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