As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#421, BOS-PBI.' ODOR EVENT DURING INITIAL DESCENT UNTIL GEAR DOWN ON FINAL; ACCOMPLISHED INFO NOTICE 2017-T015J FOUND TO BE A TRANSIENT ENVIRONMENTAL SYSTEM ODOR. SECTION B2 DECONTAMINATION LEVEL 1A PER TSM 05-50-00. A/C OK FOR SERVICE.'