As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT INTAKE HEAT FAULTED AFTER TAKEOFF. LT ENGINE INTAKE ICE ARCED AND SHORTED OUT THE OVERHEAT LT INTAKE CAUTION LIGHT AND THE CWP ICE PROOF AND LIGHT ILLUMINATED. AIRCRAFT RETURNED TO DTW. MAINTENANCE REPLACED LOWER DUCT WITH SERVICEABLE UNIT (P/N NH24668-169).