What was found
FLT 482 - DEN - PHL - BURNING SMELL - FLIGHT ATTENDANTS REPORTED AN ODOR EN ROUTE AFTER TWO HOUR IN FLIGHT. SMELLED LIKE BURNING RUBBER NEAR CENTER LAV & MIGRATED TO AFT CABIN. FLIGHT ATTENDANT TURNED OFF MAIN LIGHTS. SMELL MAY HAVE GONE AWAY. NO HISTORY FOR THIS AIRCRAFT. CHECKED ENGINES, RAN PACKS, NO DEFECTS NOTED. RELATED BURNING RUBBER ODOR INCIDENT OCCURRED A DAY AFTER. NO DEFECTS FOUND AFTER IGNITION REPAIRS ON SEVERAL ENGINE STARTS. REFER TO LOGPAGE:7157663.