Mach 460 amp repair and or mod

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Has anyone repaired or modded a Mach 460 rear amp. Last time one of mine quit I just replaced it with one off of ebay. I did take the busted one apart and found a torched resistor, but I never tried replacing it to see if that fixed the problem.

Now, I've got another blown one and I will try to fix it this time, but I was wondering if anyone has modded or repaired one before?
 
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