Arrived at location on 10/13/21 - Checked the 4th well from the left and it needs the heat light. Customer said they don’t know if it’s on or off without the light. Unit does heat. Will order and return . In service. Returned on 10/20/21 - Arrived and got ok to do work. 4th well from left. Removed the power and removed panel. Removed faulty light and installed the new heat light. Power on and unit heats and light now works allowing customer to see that it’s on. All other 5 wells ok. In service.