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Sony TA-1066 Secondary fuses blowing up

Hi everbody,

I'm fixing a Sony TA-1066 amp which just needed some cleaning up. After replacing the thermal paste on the power transistors, I accidentally soldered diode D201 the wrong way. I then tested it, which resulted in bad amplification, smoke coming out of resistor R238 and a scorching hot heatsink. Upon these phenomena, I quickly turned off the amp and let it rest, until the heatsink cooled down. From that moment on, every time I turn on the amp, fuses F304 and F304 blow up instantaneously. Have I simply destroyed the power transistors (Q110,111,210,211) or is there any short-circuit hiding I should search for?