Customer called about a bad odor coming from a wall between the guest bathroom and the guest bedroom. Customer had opened the drywall and exposed a 2†abs vent. Offered pricing to perform an odor diagnostic, customer accepted. Checked crawlspace for any signs of leaks for break. None detected. Offered to waive the diagnostic and replace 7’ of the 2†venting. Customer accepted. Cut the vent in the crawlspace and in the wall. Installed 7’ of 2†pvc with two mission bands. Caulked the pipe where it stubs up from the crawlspace. After install, odor still present. Strongest smell was coming from underneath the tub. Explained the situation to the customer. Had him smell the flooring under the carpet. Smell was one joist bay over. He cut it open to expose numerous rat droppings. After pulling out the insulation, found 4 dead mice. Pulled the insulation out and vacuumed as much of the droppings out as I could. Cleaned work area. Thank you for choosing CPI!