As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PITOT HEAT OFF LIGHT REMAINED ILLUMINATED CONTINUOUSLY FOR FIFTEEN MINUTES THEN STARTED TO FLICKER. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND TERMINAL AT S3-83 BROKEN OFF. REPAIRED TERMINAL, SYSTEM OPERATIONAL CHECK OK.