Upon arrival spoke with the customer about low pressure to his hall bath shower. Took the faucet apart and discovered the plastic handle adapter for the diverter stem was broken. Gave the customer options. He is going to order the part and try to repair it himself but an estimate was left for the repair. During my initial walk through i noticed the expansion tank had failed and the customer chose to replace it. Turned off the water to the house, remove tank, installed new expansion tank that was mounted to a bracket and mounted to the structure of the home. All work was tested and air was bled from fixtures.