Thank you for the manual link. I will review the front panel function and see what I come up with. The trigger lights to not flash any codes on startup (if I do a reboot after I get the panel to come to life).
I took the SMPS out for a visual inspection. Nothing obviously fried and no signs of electrolyte on the board. I think my next step will be to measure ESR of the electros and see what I find.
Battery on the logic board measured ~75mV. I think that counts as dead. But can that be the cause of these issues?
Any further suggestions welcome as well.