STR DB930, fuses blown help with diagnosis

Hi guys 1st post đź‘‹

Looking for some advice on the above mentioned amp. Why would it blow fuses? Noticed some black marks near the big heating. Black square with 3 pins.
Over heated?
Not very adept at this yet just learning.
Amp still powers up, no sound whatsoever.
What should I check first
Cheers guys
 

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