What was found
FLT#253, FLL-SJU. ', ODOR FELT ON DECENT. SLIGHT DIRTY SOCK SMELL THROUGH 14000. MUCH MORE AT THE GATE WITH APU BLEED RUNNING; COMPLIED WITH INFO NOTICE 2017-T015J, SECTION A, ISOLATED FAULT TO TYPE 1, (A), 3, A PER TSM 05-50-00-810-085-B / 05-50-00-810-085-D. POSSIBLE CAUSE OF CABIN ODOR IS THE APU SYSTEM. DECONTAMINATION LEVEL A, PERFORMED PACK BURN WITH ENGINES RUNNING PER AMM 21-00-00-615-803A. NO CABIN ODOR NOTED.'