As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, FA REPORTED NO WATER PRESSURE IN ANY OF THE LAVATORY SINKS OR TOILETS. GROUNDED - YES. DIVERSION TIME 29 MINUTES - FOUND WATER TANK FILL VALVE LOOSE AND ALLOWING FILL VALVE TO LOOSE PRESSURE (SUSPECT BAD VALVE CONTROL CABLE). REMOVED AND REPLACED FILL/OVERFLOW VALVE CONTROL CABLE, REF B737-800 AMM 38-11-03-000-802 AND 38-11-03-400-802. NO EVIDENCE OF LEAKS DETECTED IN ALL AREAS ACCESSED.