As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAKEOFF AND LANDING THERE WAS A BURNING ODOR DETECTED BY THE CREW. NO SIGN OF VISIBLE SMOKE. A PAN PAN WAS DECLARED. LOCAL MTCE IS INVESTIGATING. RT PACK FLOW CONTROL VALVE, RT PACK BYPASS VALVE FILTERS REPLACED AS PER AMM 21-51-01 AND 21-51-00 RESPECTIVELY, AND LT AND RT RECIRCULATION AIR FILTERS REPLACED AS PER 21-24-02 PB 401.