As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FA'S AND NUMEROUS PASSENGERS COMPLAINED OF BURNING RUBBER SMELL THROUGH 12,000' DECENT ROWS 15 AND BEYOND HAD MOST SMELL. TURNED PACK 2 OFF AND SMELL DID NOT GO AWAY. REAR FA'S HAD FUME EVENTS IN THE PAST AND CLAMED THIS WAS COMPLETELY DIFFERENT ODDER. PERFORMED OPS CHECK OF THE PACK SYSTEM REF AMM 21-63-00 NO CABIN ODOR DETECTED ON EITHER PACK REPLACED RECIRCULATION FILTERS IAW AMM 21-21-41.