As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED TO DEN DUE TO ABNORMAL NOISE UNDER AFT GALLEY. *S/D* THIS IS THE FIRST HIT FOR THIS TYPE OF PROBLEM ON THIS AIRCRAFT. MAINTENANCE FOUND THAT THE POTABLE WATER FILL VALVE WAS PARTIALLY OPEN, VENTING AIR PRESSURE OVERBOARD. NO OTHER DESCREPANCIES WERE FOUND. THE PROBLEM HAS NOT OCCURRED SINCE.