What was found
FLT#1496, CUN-FLL. ' DESCENDING THROUGH 12,000' FUME EVENT BEGAN, AND BOTH PILOTS DETECTED A MUSTY DIRTY SOCK SMELL. TURNED OFF PACK 1 AS PER ODOR ISOLATION PCDR, MOSTLY CLEARED BY 6,000'; ACCOMPLISHED INSPECTION OF APU AREA. NO FUEL / OLIS LEAK WAS NOTED AT THIS TIME. COMPLIED WITH INFORMATION NOTICE 2017-T015 SECTION A ( A ) ISOLATED FAULT TO TYPE 10 ( A ) , 1 C PER TSM 05-50-00-810-085-B / TSM 05-50-00-810-085-D. AIRCRAFT IS OK FOR SERVICE .'