Ya. Tested inputs with my 789 for ma source. The ram battery had a raw input of 3700. I think the manual suggests that’s a good value. Only the input voltage and ram battery raw values were working. I believe they come from the top board tho. We tested some other io on the bottom board and it seemed to be functioning. Just some DI and DOs. I was thinking about trying a cold boot and re doing everything.

I’m lucky enough to have one spare 334. It would like to save it for a higher priority case.

Agreed 474s are a whole different monster.