What was found
FLIGHT 2144, LGA - BOS - DIRTY SOCK SMELL IN CABIN. MAINTENANCE INSPECTED THE LEFT ENGINE SPINNER FOR SIGNS OF OIL, HPC STAGES 3-5-9 WERE BORESCOPED FOR SIGNS OF OIL, AIR MIX DUCT BORESCOPED FOR SIGNS OF WATER, THE APU AIR DELIVERY DUCT WERE INSPECTED FOR OIL CONTAMINATION, BAAT TEST ACCOMPLISHED, ENGINE PRECOOLER INSPECTED. NO FAULTS WERE FOUND. THE NR 2 PACK AIR CYCLE MACHINE AND THE NR 2 DUAL HEAT EXCHANGER WERE REMOVED AND REPLACED DUE TO COFFEE RESIDUE CONTAMINATION.