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Denon AVR-X2400H Intermittent Protection Mode on startup

Apologies for the incoming wall of text. Whenever my Denon AVR-X2400H receiver has been off for several hours most regularly in the morning, it will often go into protection mode on start. This has been happening for months. After anywhere from a minute to 20 minutes, after many restarts/moving the unit around/swearing, it will start normally and function without issue for hours until the next long period of being off. It is the dreaded PRT: DC. During this period of protection mode, it will fail to start even if I disconnect everything but power. I have swapped the power cables, tried different outlets, and let it get plenty of airflow though if it were temp related it would be a different code / not happen on first startup. I even opened up the unit, disassembled it and looked for moisture/scorch marks/loose cables before re-assembling. I have performed a couple factory resets over the last couple months. I assume the intermittent startup nature hints at a failing but not failed part, but am not sure what to replace. I have access to an engineer friend / multimeter if helpful. It is well out of warranty, but there's a part of me that wants to believe it can be salvaged, especially given current AVR prices. Other things I have tried include leaving it in ECO/network standby. There was a period where spinning the source wheel on startup would cause the AVR to lock up but not trigger protection, after which unplugging/replugging would allow it to start normally. Not exactly scientific.

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