As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT AT CRUISE ALTITUDE, CREW DETECTED A BURNING ODOR IN THE ACFT. ODOR WAS GREATER TOWARDS REAR OF ACFT. ODOR DISSIPATED DURING DESCENT. ON GROUND, COULD ONLY DETECT A VERY FAINT ODOR REMAINING IN THE LOWER LOUVERS ADJACENT TO THE LAV MIRROR. RAN ACFT AT HIGH POWER WITH BLEED AIR AND WING ANTI-ICE ON. NO BURNING ODOR NOTED.