Panasonic SA-HE100 AVR - OVERLOAD (Fremont-Sundale/28 Palms)

Panasonic SA-HE100 AV Receiver, 2003 model with 5.1 surround. Analog and digital optical inputs, no HDMI.
Started displaying an overload error within a few minutes of use. Seems to work OK with only 2 speakers connected, but don't know how long this will last.
Some people have traced this to a malfunctioning IC601 MOSFET. (https://www.diyaudio.com/community/threads/panasonic-sa-he100.389411/)
There is a long thread here about how to replace 1-2 MOSFET's to fix this on the SA-HE200 (the more expensive sibling to the SA-HE100).
https://www.avsforum.com/threads/panasonic-sa-he200-avr-overload.1149887/
The same approach may work on the SE-HE100.
This is all beyond my skillset. If you want to try (or are just looking for free DSP parts) you can have this unit for free.