Supply, fixture, and drain share one frame
A wet sink cabinet may involve faucet tubes, stops, filter equipment, basket strainers, trap, disposal, or appliance discharge. Dry reachable parts and observe at rest, under hot and cold flow, while a basin drains, and during a safe appliance cycle. The first wet point and timing matter more than the largest puddle.
In a bathroom, a dripping outlet, shower valve, enclosure, drain, toilet tank, flange, and branch line have different signatures. Record which use creates the change and whether another fixture moves. Do not repeat an overflow merely to prove it.
Study a sink-cabinet leak