As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#579, DCA-FLL. 'TOXIC FUME SMELL DIRTY SOCK ON APPROACH FROM 6000 FT TO 3000 FT. INFLIGHT CREW STILL SMELLED IT IN THE CABIN AT THE GATE. PILOTS DONNED O2 MASKS FROM 6000 FT TO 3000 FT; COMPLIED WITH INFO NOTICE 2017-T015, SECTION B2. IDENTIFIED ODOR AS OIL COMING FROM APU. DECONTAMINATION LEVEL 1 (A) WAS ACCOMPLISHED PER TSM 05-50-00-810-085. AIRCRAFT IS OK FOR SERVICE.'