As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB SHORTLY AFTER WING ANTI-ICE WAS TURNED ON, A THUMP WAS HEARD IN THE TAIL COMPARTMENT FOLLOWED BY A LOWER AFT BODY OVERHEAT INDICATION. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED BLOWN ANTI-ICE DUCT ON LEFT SIDE OF AFT VENTRAL AIRSTAIR COMPARTMENT. OPERATIONAL CHECK OF ANTI-ICE SYSTEM CHECKED NORMAL.