As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3345 - EN ROUTE FROM DTW TO CVG, THE LEFT INTAKE HEAT WOULD NOT FUNCTION WHEN SELECTED ON. THE AIRCRAFT RETURNED TO DTW WITHOUT INCIDENT. MAINTENANCE PERSONNEL REPLACED THE LEFT INTAKE HEAT VALVE AND REPAIRED BROKEN WIRES AT THE INTAKE HEAT VALVE CANNON PLUG. ALL SYSTEMS OPERATED SATISFACTORILY. (M)