Well I took it in and it turns out the set resistor on the 7805 burned up. Still trying to figure out if it's possible to rebuild or if replacement boards are available. Kemper USA isn't being responsive to my shop, but I'd rather not ship to the closest authorized repair center (anyone have experience with Advanced Musical Electronics in LA?). Anyone ever run into anything like this? I had it behind a surge protector, which wasn't tripped, and there weren't any other signs of surges, etc.
Before and after hot air desoldering:
https://photos.app.goo.gl/3NYTMic5Z5nRikbm8