A bathtub leaking from the overflow area during a bath is usually caused by a worn-out, dried-out rubber overflow gasket sandwiched between the back of the tub wall and the overflow elbow. As rubber ages, it flattens and cracks, allowing splashing bathwater to seep through the mounting hole and leak behind the wall or down to the ceiling below. Verification: Pour a cup of water directly around the overflow opening and inspect behind the wall to confirm if the gasket is failing.
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