Code shows temperature sensor failure. After disconnecting power and water to unit, I pulled it out, tipped it back, removed cover plate(2 screws). I then disconnected sensor from sump and pulled it out. Used old seal, just gave it a quick wipe and rubbed on a dab of vaseline to keep it supple.Installed new sensor. Replaced cover plate, cleaned out webs and dust bunnies from cabinet cavity, and replaced unit into cavity. Re-installed water and power, ran test cycle. Total time: 76 minutes, though sensor replacement is 5 minute job.