As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT INOP AMBER TURN KNOB INDICATION ON PFD'S. TURN KNOB WAS IN THE CENTER POSITION. POSITION. REMOVED AUTOPILOT CONTROLLER & INSTALLED SERVICEABLE AUTOPILOT CONTROLLER REMOVED FROM A/C 560XL-5176 N876QS FOR CONTINUED SERVICE ON 560-5264 N664QS AUTO PILOT CONTROLLER CHECKS GOOD IAW CESSNA 560XL MM 22-11-03.