Jl audio 300/2 please help!

Hello,
I have bought faulty Jl 300/2 audio amp. Amp was repaired an unauthorized person before.

+-53V ok.
-+15V ok. (+-17V)
r513 resistor 3.8V near yellow transformer.
Driver boards led are fine (Green LIGHTS ON). Some driver transistors are hot.

Right channel Q300 FET source joint burning when amp is on. Fets are new and OEM. No short! good solder joints. Gate resistors are fine. Current is very high over 5 amps.. Amp self shut down..
So I decide remove R channel q300 q301 fets and make test again. Current became stable 1,2A. Amp stop switching OFF. I check gate voltage (remote ON) q300 q301 is 0V. So problem is driver board. I take it off driver board and check few first transistors directly from q300/301 gate they are fine... Some driver board transistors are hot..
Left channel gate resistors are fine and voltage is ¬3.5V (REMOTE ON). 0V remote off. I am idiot and kill left channel driver board too :mad: . I just touch driver board and amp current became very high again about 4amps, but amp wont switching again... Now left channel fets gate voltage when remote in ON = 0v.

Any Ideas?

THANK YOU!