Help in repairing Hifonics BX1500d

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Hi, i am from Argentina, where no one knows how to repair this amp. I was wondering if someone could help me discovering the problem with the amp:

Low power output, i have a rockford fosgate rfd2215 600 rms 4+4 hooked in parallel to get 2 ohms, it nearly doesn´t move, i have to turn full up the bass knob to get some bass.
The amp doesn´t shut down, the woofer is ok, it was checked with another amp.

It´s difficult to repair it?

If more information is needed, let me know.

Thanks a lot and forgive my english.
 
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