As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORT: UNABLE TO FILL POTABLE WATER. FWD DRAIN VALVE STUCK OPEN. DURING TROUBLESHOOTING FOUND FWD WATER DRAIN VALVE FROZEN. CURRENTLY WORKING CLOSEUP. REMOVED AND REPLACED FWD DRAIN VALVE PER MM. LEAK CHECK GOOD. VALVE STILL OPERATES STIFF, SUSPECT CABLE. NIS FLL. OLD VALVE WAS DEAD. DISCONNECTED MANUAL CABLE FOR DRAIN VALVE. OPERATED VALVE ELECTRICALLY. VALVE WILL NOT CLOSE COMPLETELY. REQS NEW VALVE PCN 644-0123. REPLACED FILL DRAIN VALVE PER AMM, LEAK CHECKED OK. BUT MANUAL CABLE IS STIFF AND NEEDS REPLACED.