As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 5091, WHILE CLIMBING THROUGH FL 280- FL 300, FLIGHT ATTENDAT REPORTED "ROTTON EGG" SMELL DURING CLIMBOUT. CYCLING FROM PRESENT TO NOT PERSENT EVERY FEW MINUTES. EQRH STEPS TAKEN TO ISOLATE ODOR COMING FROM PACK 1. PACK 1 TURNED OFF FOR REMAINDER OF FLT. NO ODOR PRESENT. CORRECTIVE ACTION: T/S SOURCE OF ODOR TO NO.1 ENG OVERSERVICED. RAN NO. 1 ENGINE AND DRAINED TO PROPER LEVEL. REF AMDS 0550-2002 AND A321 AMM 21-00-00-615-803-A. (LP 7190572, 1278749)