As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 1 ENGINE INTAKE ADAPTER CB TRIPPED IN FLIGHT. DIVERTED TO BASE. MAINTENANCE FOUND THE NR 1 INTAKE ADAPTER BURNED FROM ARCING. REPLACED NR 1 ENGINE AIR INTAKE ADAPTER HEATER IAW AMM 30-21-15-000-801 & 30-21-15-400-801, PARA 1-4, COMPLETED, PARA 5 OPS CHECK GOOD.