I think you have a leaking IRF640. Disconnect the gates of the IRF640s the easiest way possible. Sliding the gate resistors off of their pads is likely the easiest. After disconnecting the gates, measure the resistance from the gate to the drain on each 640. Do any read anything other than open?
Do NOT apply power with the gates disconnected from the drive circuit.
Do NOT apply power with the gates disconnected from the drive circuit.
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