Completed home care inspection. Replaced two shower cartridges. The shower in the hall bathroom had a drip from the tub spout. I replaced the cartridge to resolve that issue. The seals on the sides of the cartridge had deteriorated causing a sealing issue. Master bathroom shower was takin a long time to get hot water. All other fixtures were getting hot within 5 seconds. Tested for a cross connections. Inspected pump and check valves for proper installation. I replaced the shower cartridge suspecting it has failed causing a cross connections or improper mixing. I tested the shower again after replacing the cartridge and it took 20 seconds for the water to get hot. This was a big improvement over the 4-5 minutes prior.