As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN STABILIZED APPROACH, AUTO PILOT VERY UNSTABLE IN PITCH AXIS A SERVO. AUTO PILOT PTICHES UP AND DOWN WITH ASSOCIATED TRIM RUNS TO TRY AND CAPTURE GLIDE SLOPE. A/C RELEASED FOR SERVICE PER MEL 22-1G CATEGORY C EXP 6-30-96 AUTO PILOT GLIDE SLOPE FUNCTIONS INOPERATIVE. REPLACED VOR/ILS RECEIVER, PER MM 34-31-21.