As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER A FEW FLIGHTS WITH THE RECENTLY INSTALLED ADI IN THE PILOTS POSITION, THE GLIDESLOPE INDICATOR FAILED IN THE CENTER POSITION (INDICATING ON GLIDE PATH). INDICATOR REMAINED PARKED IN THIS POSITION FOR THE DURATION OF THE FLIGHT. REMOVED AND REPLACED UNIT. UNIT WAS OVERHAULED BY METRO AIRCRAFT INSTRUMENTS