Fixed leaking pressure relief valve on aging A.O. Smith water heater. replaced valve & inspected tank - no corrosion issues visible. flushed system to remove sediment buildup. tested thermostat & heating element - both functioning normally. unit is 9 yrs old but still in decent shape. customer should get another 2-3 yrs life with proper maintenance. showed homeowner how to do annual flush to extend life. quick fix today saved them $$$ on replacement!