What was found
FLIGHT 5620 - RECEIVED STAB TRIM/MACH TRIM CAUTION MESSAGES. RETURNED TO AIRPORT, LANDED WITHOUT INCIDENT. REPLACED HSTCU. NO FURTHER DEFECTS.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLIGHT 5620 - RECEIVED STAB TRIM/MACH TRIM CAUTION MESSAGES. RETURNED TO AIRPORT, LANDED WITHOUT INCIDENT. REPLACED HSTCU. NO FURTHER DEFECTS.