As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTS A SULFERIC ODOR ON MULTIPLE OCCASIONS, COMING FROM THE AREA OF THE AFT RIGHT GALLEY DRAIN. PERFORMED AMM 05-51-26. DURING ENG RUNS, NOTED NO ODOR IN AFT GALLEY OR CABIN. FOUND COMPARTMENT BY AFT GALLEY DRAIN DIRTY, GIVING BAD SMELL IDENTICAL TO FLIGHT CREW BRIEFING. CLEANED COMPARTMENT, NO ODORS NOTED. ACFT OKAY FOR RELEASE WITH NO OTHER FINDINGS.