As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4511 - DURING CRUISE FROM CHS-DFW, THE CREW NOTICED A SLIGHT OILY AND MOLDY ODOR WHEN THE PACKS WERE OPERATED OFF THE TENTH STAGE BLEEDS WITH NO VISIBLE SIGNS OF SMOKE. THE AIRCRAFT LANDED SAFELY IN DFW. MAINTENANCE COULD NOT DUPLICATE THE ODOR ON THE GROUND. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)