As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5524 - EN ROUTE CMH-JFK RECEIVED A STAB AND MACH TRIM CAUTION MESSAGE, STAB TRIM FAILED TO RESET. CREW DECLARED AN EMERGENCY AND RETURNED TO CMH. FLIGHT LANDED WITHOUT INCIDENT. PERFORMED STAB AND MACH TRIM RESET, OPERATIONAL CHECK SATISFACTORY.