As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT DIVERTED DUE TO VIBRATION AND LOUD GRINDING NOISE COMING FROM AFT GALLEY AFTER TAKEOFF. AFT F/A REPORTED THAT NOISE DISSIPATED WHEN CYCLING GALLEY DRAIN VALVE, THEN RETURNED. UPON INVESTIGATION FOUND AFT GALLEY DRAIN VALVE AT FAULT. R & R AFT GALLEY DRAIN VALVE IAW AMM 38-31-04-04, CKS GOOD.