As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 347 - DURING CLIMB THROUGH ABOUT 20000 MGL, A STRONG ODOR OF FUEL WAS PRESENT IN THE CABIN AND IN THE COCKPIT WHEN LEFT PACK WAS TURNED OFF. THE SMELL DISSIPATED WHEN BOTH PACKS BACK ON. DURING CRUISE, THE ODOR RETURNED. AIR CYCLE MACHINE LEAKING OIL ON TURBINE. REPLACED AIR CYCLE MACHINE. SYSTEM GROUND CHECK NORMAL OPERATION. (M)