As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT DISCONNECTS AND AUTOPILOT (FAIL A CAS) MSG COMES ON ONCE THE NOSEDOWN TRIM (PRIMARY) SETS TO +1.2. C/W HORIZONTAL STABILIZER TRIM ADJUSTMENT AND TEST IAW CE680 M/M 27-40-00. ADJUSTED ACTUATOR AS REQUIRED. TRAVEL AND OPS CHECK GOOD.