Replaced the controller board. The "stuck button" was actually a stuck encoder line from the cycle selector knob. The times of the cycles were different than the normal operation times - like towels for 1:15 instead of 1:00 - and other features weren't available that should be. Took a little while longer than expected, because the included instructions had a step for an older model of dryer that should be ignored for my model, and that took a while for AppliancePartsPros to confirm it.