As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INITIAL CLIMBOUT, A STRONG SMOKEY SMELL WAS NOTICED IN THE BACK OF THE A/C AND IN THE COCKPIT. SMELL STABILIZED AS CLIMB CONTINUED BUT DID NOT CLEAR UNTIL DESCENT BACK INTO ATLANTA. PERFORMED DUCT BURNOUT PER M/M AND REPLACED COALESCER BAGS. RAN BOTH ENGS TO T/O POWER WITH BOTH PACKS OPERATING. NO EVIDENCE OF SMOKE OR SMOKE SMELL.