As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED A BURNING ODOR IN THE CABIN APPEARING TO BE COMING FROM THE AIR CONDITIONING PACKS. MX PERFORMED AN OPS CHECK OF THE AIR CONDITIONING PACKS SUCCESSFULLY WITH NO ABNORMAL ODORS COMING FROM THE PACKS. UPON FURTHER INVESTIGATION MX DID DISCOVER A BURNING ODOR COMING FROM CABIN LIGHT 5A AND 6A. REPLACED LAMPS OPS CHECKED SUCCESSFUL. ACFT WAS APPROVED FOR RETURN TO SERVICE.