As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT AIR INTERRUPTED INTO BNA DUE TO HOT SPOT AND DISCOLORIZATION OF SIDEWALL PANEL AT SEAT 17A. FOUND OVERWING DE-ICING HEATER OVERHEATING. PULLED AND COLLARED CIRCUIT BREAKER AND PLACARDED SYSTEM. AIRCRAFT DEPARTED TO BWI. SYSTEM GROUND CHECKED NORMAL OPERATION.