Commercial water heater repair. Lower level hot water heater. Bradford White Model#CEHD120A4533LCF with a 119-gallon capacity. I inspected the water heater electric system and found two problems. Found an electrical fault with the contactor wiring burnt. Made the necessary repairs. I also found the top right element black wire was not connected to the element; I put it in its place on that element. Checked all elements, contractors, and fuses to ensure they were operating safely. I flushed the water heater return line. I flushed the heater tank. Inspected the water heater expansion tank at 59 psi. Found the water heater tank temperature was low, 115, it needs to be a minimum of 140F to kill legionella. They would like a minimum of 122* on the return, but the system has a mixing valve unable to get that on return due to the type of mixing valve.