So this conclusively tells us that the uC is the culprit. There’s no need to swap the transistors and please do not use sockets on them. Sockets have a tendency to become unstable over time, causing more problems down the road.
Unfortunately, this isn’t a warranty issue because the uC was most likely damaged in this way from static electricity in assembly. We do a pre-flight test on all these microcontrollers before they are shipped, so I can say it was working when we shipped it. We do sell replacement microcontrollers, if you don’t have a way to flash one. But if you are able to borrow a PC and get a usbtiny programmer (available many places online), the flashing procedure is very easy to do. We give step-by-step instructions in the updater app (press the “?” in the app window).
But all this being said, please contact me at info “at” zeppelindesignlabs.com and we can work with you to figure this out.
-Brach