Arrived on site to perform plumbing inspection. Upon inspection in the crawlspace I noticed a section of pipe where the kitchen drops into the main there is a belly and the 4” main is not strapped. Also on the kitchen line there is a no hub coupling being used as a reducer where it goes from 2” to 1 1/2 and the 4x3x4 tee wye is on its back. Also when going in the garage to check out the heater and boiler there was a slight drip on a gate valve by the water heater that has a bleeder cap on it.