Customer called in about having a minor leak by water heater. Upon arrival, found a little water puddle underneath T&P drip tube. Checked inside the insulation of where leak is and it’s dry. Checked drips tube snd drip tub has moisture. T&P valve is leaking from water heater. Checked expansion tank and tank is full of water. This indicates that expansion tank has failed. Checked water pressure and water pressure is at 60psi. Pressure should be between 60-80psi. Educated customer on how each component works on water heater. Due to expansion tank failing, pressure building up inside water heater caused T&P to pop and relief built up pressure in system. Recommended we replace expansion tank and T&P valve as well. Gave customer options and customer opted to go with expansion tank and T&P valve replacement. Went ahead and replaced both components. Noticed lot of calcium build up and showed it to customer. Went ahead and did a courtesy water heater flush for customer to help get rid of as mu