As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL430 ACCIDENTALLY HIT TURN KNOB, AUTO PILOT WOULD NOT WORK CORRECTLY. IN HEADING MODE IT WOULD ALWAYS STOP 10 DEG SHORT OF THE HEADING BUG. NO FAULT CODES REPORTED. DISCREPANCY RELATED TO INVERTER FAULT. INVERTER SELECT SWITCH REPLACED. OPERATIONAL CHECK GOOD. IAW MM CH 24-20-04.