What was found
MIA - FLIGHT ATTENDANT REPORTED BURNING PLASTIC OIL RUBBER SMELL IN FIRST CLASS ABOUT 15 MIN INTO FLIGHT. NO FIRE OR SMOKE INDICATION IN COCKPIT BUT FLIGHT ATTENDANT ALSO REPORTED WARM SPOTS ON FLOOR AT ROWS 1 AND 2 HJ SIDE EMERGENCY DECALS. EMERGENCY DECLARED RETURNED MIA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED RIGHT RECIRCULATION FAN AND BOTH EQUIPMENT COOLING FANS. SYSTEM GROUND CHECK NORMAL OPERATION.