As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON FINAL APPROACH COURSE WITH BOTH LOCALIZERS AND GLIDESLOPE INITIALLY CAPTURED ON AUTOPILOT, THE AUTOPILOT WAS NOT CAPABLE OF FLYING THE GLIDESLOPE. AIRCRAFT DOVE FOR THE GROUND. PERFORMED OPERATIONAL CHECK OF AUTOPILOT SYSTEM IAW 727 MM CH 22-00 AND SELF TEST OF PITCH COMPUTER IAW 727 MM CH 22-00 PG 511. NO FAULTS FOUND.