As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED DURING CLIMB OUT, FIRE INDICATION IN AFT CARGO ILLUMINATED. CREW NOTED THE INDICATION OCCURRED AFTER SELECTING ON THE WING ANTI-ICING. AIRCRAFT RETURNED BACK WITHOUT FURTHER INCIDENT. MAINTENANCE CLEANED AFT CARGO COMPARTMENT PNEUMATIC DUCTS AND DETECTION LOOPS EXTERNALLY OF DINATROL RESIDUE. PERFORMED ENGINE RUNS AT BLAST FENCE AND CHECKED SYSTEM IAW MM. OPS CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.