As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN SWITCHING FROM FGS (A) TO FGS (B) THE CLACKER COMES ON IMMEDIATELY AND DOES NOT STOP. THE STAB DOES NOT MOVE. SWITCHING BACK TO FGS (A) CANCELS THE CLACKERS. REMOVE AND REPLACED FGC CONTROLLER WITH REPAIRED UNIT FROM HONEYWELL RS LV2R992K PER CESSNA 750 MAINT. MANUAL CHAPTER 22-10-03. GROUND OP'S CHECKED GOOD.