NordicTrack S15i exercise bike with digital display. Can be used with or without an iFit subscription.
The resistance and incline controls work, but they have no effect on the bike. I've been in contact with NordicTrack support, and they think it's the main control board, which they no longer make. Posting this to see if anyone is interested in trying to fix it. The control board is available aftermarket (link below). No guarantee this is the issue, but anyone willing to come pick it up is welcome to give it a try. Probably need a couple of people to help move it.
This is the aftermarket board: https://www.treadmilldoctor.com/nordic-track-power-board-part-number-412766