Customer stated that there was low flow on hot water and shower. Tested and found that on cold side water pressure was fine and then as soon as we went to the hot side, there was no water pressure. Turn water off the house and took a part to inspect cartridge and shower valve. Didn’t find any issues or buildup on cartridge. Stated to customer that the best moving step will be is to replace the shower valve. At this time, customer did want to proceed with any further work. Will semd estimates for plumbing repair repairs needed.