Plumbing Repair near 9th St. A client reached out to us regarding a leaking toilet tank. Upon examination, I found that the issue stemmed from a deteriorated flush valve gasket. To fix the problem, I shut off the water supply, drained the tank, and carefully replaced the old gasket with a new one. After reassembling the tank and restoring the water supply, I verified that the leakage had ceased and ensured the toilet was in proper working condition.