Send it to Madrigal, please. That is what they recommend (if it was safe or easy, the procedure would be in the owner's manual). Poking around in power supplies of hefty SS amps is deceptively dangerous.
Respectfully, and with no offense to anyone, I would not trust any advice on this matter unless it's from a qualified technician.
Respectfully, and with no offense to anyone, I would not trust any advice on this matter unless it's from a qualified technician.