Remove top and bottom cove and test thermostats and Elements to determine bad part Drain water heater and replace lower heating element Upon arrival customer explained that water drain would have a bad smell found that washer drain hose was stuck down into trap and when I pulled it up I could hear a lot of water poring out made customer aware I believe it was siphoning water out of trap allowing sewer gas to come back into home so I raised line and strapped to stop it from falling back in if smell comes back customer will call Customer also made me aware that hot water didn’t last very long at all so I ran hot water and checked temperature. Temperature was at 120f but only lasted 8 minutes so customer approval I checked water heater in garage and found that it was only 3 years old and lower element was bad with additional approval I drained water heater and replaced element and at not extra charge went ahead and replaced lower thermostat as well fill heater and is now heating pro