What was found
(CAN) STAB TRIM AND MACH TRIM CAUTION. FOLLOWED QRH, MESSAGES DID NOT CLEAR. ATB TO DEPARTURE AIRPORT. EMERGENCY WAS DECLARED. CORRECTIVE ACTION: R & R HSTCU. (TC# 20180510014)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) STAB TRIM AND MACH TRIM CAUTION. FOLLOWED QRH, MESSAGES DID NOT CLEAR. ATB TO DEPARTURE AIRPORT. EMERGENCY WAS DECLARED. CORRECTIVE ACTION: R & R HSTCU. (TC# 20180510014)