What was found
FLT 950, GND-JFK. DIRTY SOCK SMELL FROM PACK NOTICE IN DECENT SEE CABIN ODOR REPORT. (APU BLEED AIR SUPPLY SYSTEM) TROUBLESHOT PER INFO NOTICE 2017-T015C SECTION "B". FOUND OIL ON THE MATTING SURFACE OF APU INTAKE WHERE INTAKE DUCT SEATS. ENG RUN & CHK PERFORMED TO ISOLATE ENG. NO DEFECTS FOUND ON ENG. CONCLUDED APU TO BE THE CAUSE OF SMELL. APU BLEED AIR SUPPLY PUT ON MEL 36-12-01 CATEGORY "C". REQUIRES FURTHER TROUBLESHOOTING OF APU, FOR LEAKS. REQUIRED MORE GROUND TIME. SUPPLEMENTAL INFORMATION TO FOLLOW.