As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM RESPONDS INTERMITTENTLY AND WITH LIMITED RESPONSE TO BOTH PILOT AND CO-PILOT PRIMARY TRIM SWITCH INPUTS. SWITCHED TO SECONDARY TRIM WITH SAME RESULTS. NEVER RECEIVED AN ASSOCIATED AMBER CAS MESSAGE. R & R HORIZ STAB TRIM ELECTRONIC CONTROL MODULE. SYS OPS, CHECK GOOD IAW MM 27-40-00.