As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURNIG CLIMB, THE AIRCRAFT RETURNED TO DEPARTURE DUE TO A HEAVY ODOR LIKE RUBBER BURNING IN THE CABIN. PERFORMED AMM 05.50.00.810.831.A AND DID NOT FIND POSSIBLE CAUSE OF ODOR, DURING THE INSPECTION OF AVIONICS EQUIPMENT VENTILATION SYSTEM, FOUND THE DEMISTER FILTER AND CARTRIDGE DIRTY. DEMISTER FILTER AND CARTRIDGE FILTER WERE REMOVED AND REPLACED IAW AMM 21-26-43. PERFORMED ENGINES LEAK CHECK IAW TSM 71-00-00, AND NO ODOR AND NO OIL SMOKE DETECTED. THE AIRCRAFT RETURN TO NORMAL OPERATION.