As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 2972 HSV TO PHL, THE AIRCRAFT DIVERTED TO CLT AFTER THE ANTI-ICE SYSTEM CAME ON IN FLIGHT FOLLOWED BY A REDUCTION IN AIRSPEED, BOTH UNCOMMANDED. MAINTENANCE TROUBLESHOT THE SYSTEM AND REMOVED AND REPLACED THE ICE DETECTORS AND RELAYS.