Snaked P-trap and branch line of master shower to clear hair. Tightened Roman tub faucet. Attempted to fix loose handle in same bathroom. Pulled and reset cartridge in upstairs bathroom toilet attempt to fix leak. Advised customer to reach out to Delta for replacement parts. Inspected water heater and tested pressure. While looking at main shutoff, realized that the house might have been grounded to copper water service that has been replaced with HDPE. Recommended to have an electrician out to inspect grounding.