The transistors heatsink is in the high voltage side (not the diodes one), so an electricity leak would be live.
They are bolted to the heatsink and there's an electric isolating and heat conductive sheet between the each transistor and the heatsink (probably made of mica) that makes the heatsink not ot be live. If this sheet fails you have shortcircuit in the PSU.
All I can tell is that this thing is working correctly at the moment.
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