What was found
LGA - FLT 0313 - AFTER TAKEOFF LGA, FLIGHT ATTENDANT NOTED A STRONG OIL SMELL AND SMOKE IN CABIN. ACCOMPLISHED ABNORMAL PROCEDURES AND AIRCRAFT RETURNED LGA AND LANDED WITHOUT INCIDENT. REPLACED APU, COALESCER BAGS, AND BURNED PACKS OFF AFTER CHANGE. AIRCRAFT FLEW ON FUNCTIONAL CHECK FLIGHT AND NO ODOR WAS NOTED. SYSTEMS CHECKED, NORMAL OPERATION AND AIRCRAFT RELEASED INTO SERVICE. (X)