Apocalypse AAB-2900.1D/Sound Digital 3000.1 rebuild

Apocalypse AAB-2900.1D same as Sound Digital 3000.1evo.

I've cleaned up everything, new ps gate resistors and mosfets. I do have switching pulses.

There are 2 rectifier diodes - S1 and S2. One of them is dead short across all pins - S1. S2 is OK. Is S2 = MBR40250TG or MUR1620CTG ? So S1 would be his counterpart ?

Do I need Positive Common Cathode + Negative Common Anode rectifier ? As this is only a positive +rail amp, shouldn't be S1 the same as S2 ?

I've tried to power up the amp with just the healthy one, but with no avail. The 3 indicators are being light up, the power one cycles, as the amp tries to run but no rail voltage is being build. I think I need both of the rectifiers.
 

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