As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE, DURING DESCENT THE AUTOPILOT ROLL FUNCTION DISENGAGED WHEN THE LT SIDE BARREL WAS MOVED FORWARD FOR DESCENT. NOSE UP AND DOWN TRIM WITH THE BARREL WILL DISENGAGE ROLL MODE BECAUSE IT WILL INADVERTENTLY TRIM LEFT & RIGHT WHEN BARRELING UP OR DOWN.