As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3851 IN CRUISE FLT FLIGHT ATTENDANTS NOTICED FAINT BURNING RUBBER / ASPHALT ODOR NEAR AFT LAVATORIES ON CPT SIDE. NO SMOKE WAS NOTICED AND ODOR EVENTUALLY DISSAPATED ON ITS OWN. SMELL WAS NEAR. ROW 35 AND 36. CORRECTIVE ACTION: INSPECTED BOTH RECIRC FAN AND FILTERS. REPLACED BOTH FILTERS PER SAME FIM. (6468916).