What was found
JFK - INFLIGHT T1453 AFTER TAKEOFF FROM LGA, FLIGHT ATTENDANT AND FLIGHT CREW NOTICED ODOR. CABIN VISIBILITY REDUCED BY BLUE/GRAY SMOKE OBSCURING VISION FROM FORWARD TO AFT CABIN. TURNED OFF PACKS, GALLEY POWER, AND RECIRCULATING FANS WITH NO AFFECT. LANDED AT JFK WITHOUT INCIDENT. FOUND APU CHIP DETECTOR O-RING LEAKING. REPLACED APU CHIP DETECTOR O-RING, ACCOMPLISHED PACK BURN AND PLACARD APU PER MEL. SYSTEM GROUND CHECKED NORMAL OPERATION.