Customer called in needing water heater looked at. Currently water heater is working. Water heater is 12 years old. Customer is the original homeowner and house was built 12 years ago. Customer mentioned that they believe the water heater is starting to go out because they’re getting inconsistent hot water in their master shower. I asked customer if hot water inconsistency is throughout the house or just at their shower. Customer mentioned that they’ve only noticed at their shower that they’re having inconsistency of hot water. Went to look at the upstairs shower and looked at both shower valves. Informed customer that he may be having issues with the showers themselves and may not be a water heater issue. Informed customer that we can definitely start with a rebuild in both shower valves and see if they still have a hot water inconsistency issues. Customer also had me look at a leak they noticed down in their utility room. Leak seems to be coming from toilet check the surrounding floo