What was found
FLT# 880, MBJ-JFK. ODOR EVENT EXPERIENCED IN COCKPIT DECENDING TO FL180. EVENT WAS ALSO OBSERVED THROUGH 6000 FEET BY CABIN CREW. ISOLATION OF PACK 2 APPEAERED TO REDUCE THE EFFECTS. APU WAS NOT ON DURING EVENT; REF LOGPAGE 4408384 ITEM 2.(PERFORMED INSPECTION OF FWD CARGO COMPARTMENT FLOOR SELECTOR VALVE DUE TO EVIDENCE OF HYD FLUID FROM FWD WEEP HOLES. FOUND B NUT LOOSE, TORQUED TO SPEC REF AMM 52-36-12. NO LEAKS NOTED WHILE Y HYD PRESSURIZED + OPERATING SELECTOR VALVE. REPLACED HEPA FILTERS AS PRECAUTIONARY. PREFORMED DUAL ENGINE IDLE RUN REF AMM 72-00-00, ISOLATED PACKS, NO ODOR NOTED. Y + G HYD SERVICED REF AMM 12-12-29. A/C OK FOR CONT SVC) NO FURTHER ODOR NOTED. A/C OK FOR CONT SVC.