As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1269, BOS-FLL. 'DESCENDING THROUGH 5,000' WE EXPERIENCED STRONG "DIRTY SOCKS" ODOR -BOTH ENGINE BLEEDS ON -BOTH PACKS ON UNABLE TO ISOLATE SOURCE; COMPLIED WITH INFO NOTICE 2017-T015 SECTION B2 IDENTIFIED ODOR COMING FROM APU PLACED APU ON MEL DECONTAMINATION LEVEL B WAS ACCOMPLISHED PER TSM 05-50-00-810-831-A. AIRCRAFT IS OK FOR SERVICE.'