As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM CH1 AND CH2 DISCONNECTED ON T/O MACH TRIM WILL NOT ENGAGE AND A/P PITCH TRIM CAUTION MSG. FOLLOWED QRH AND RETURNED TO DEPARTURE GRND PROX FLAP OVRD SWITCH SELECTED. (ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED) R & R PILOT SIDE HORIZ STAB TRIM SWITCH ASSY IAW AMM 27-41-05. OPS CHECK GOOD IAW AMM 27-40-00-710-802. NO DEFECTS NOTED. (CLOSED)