Customer had a very small and dry stain in the living room. Ceiling directly below a toilet in the guest bathroom. Customer had a small solo cup sitting underneath the stop valve for the toilet.The stop valve was slowly leaking. A customer agreed to have their supply line and stop valve replaced. I turned the water off at the main next to the water. Heater and partially drained down the house on installed supply line and stop valve. And replace both items. Afterwards, I slowly turn the water back on and primed. All the air out of the lines and fixtures. Checking to make sure there was adequate flow.And no clogged aerators afterwards. Check the new supply line and stop valve for leaks. No leaks. Thank you for choosing and trusting t e with your plumbing needs