Upon arrival we were shown to a main line kitchen stoppage. An estimate to clear it from the roof was agreed on and after the stoppage was clear we ensured the line was clear by filling and draining both sinks. Pulled back the cable and it had grease on it and recommended bio one. The customer purchased a bottle and we instructed him on how to use it. We were then informed about the shower not getting hot. The estimate for the diagnostic was signed and we were unable to identify the cartridge however, when we put it back in, the water got hot. We’re still going to get estimates for a new cartridge or valve if we cannot find the cartridge sent to the customer