As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1287, PVD-PBI. 'DESCENDING THRU 14,000 STRONG EXHAUST FUME SMELL BEGAN INFLIGHT COULDN'T SMELL IT. AN ODOR ISOLATION PROCEDURE FOR PACK 1 WAS PERFORMED AND THE SMELL WENT AWAY. WE TURNED THE PACK BACK ON A FEW MINUTES LATER AND IT CAME BACK. WE TURNED OFF PACK 1 FOR THE REST OF FLIGHT; ACCOMPLISHED FIM TASK 21-20-00-810 TRANSITORY CONDITION FOUND COULD NOT DUPLICATE ON GROUND. SYSTEM OPS CHECK NORMAL.'