What was found
FLT 179, DIRTY SOCK SMELL REPORTED BY NR 1, 2 AND 3 FA'S AFTER SHUT DOWN AT GATE. FA'S NOTICED ODOR DURING CLIMB, CRUISE & DESCENT. COCKPIT CREW NOTICE ODOR AT 4,000' AND ARRIVAL LASTING REMAINDER OF FLIGHT, NO ACTION TAKEN. C/W INFO NOTICE 2017-T015E SEC "B" LEVEL 2, FOUND APU INTAKE CONTAMINATED FROM INTERNAL LEAK. ACCOMP PACK BURN WITH EXTERNAL AIR SOURCE, NO FOUL ODOR NOTED, A/C OK FOR CONT SVC. PLACED APU ON MEL. OPEN