What did you do to your Class A MH today???

Getting RV ready for fall season, first on the list was fix WH, light on switch stopped lighting, tested power and it was getting it at the switch but not lighting. Replaced switch and still no light, this time I tested the neutral wire and it was open. Traced it back to circuit breaker and found a loose connection but not the problem. Real cause was technicians PO used to fix WH didn't know what they were doing, they cut the supply wire and used wire screw on clamps instead of replacing wire into the circuit breaker or soldering the connection.