OK, I really thought having Achievements in Octoprint was a lame idea, until now...This is funny.
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Thought it might be the thermister in the heat bed. I happen to have a spare, swapped it out. No go 
All wires are firmly attached, followed into box. Connector is secure, looks like the mainboard is fritzing.
Can't really complain. Its a TAZ 5. Gotta be 15 years old by now. Lots of mods, but maybe its telling me it time to move on.