As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AIRCRAFT WOULD NOT DESCEND IN OPEN DESCENT MODE TO 5000 FEET AND A WARNING TO 3000 FEET. VERTICAL SPEED WAS REQUIRED TO DESCEND. MAINTENANCE PERFORMED CAT III LAND CAPABILITY TEST PER AMM 22-97-00 AND AFS TEST PER AMM 22-96-00. NO FAULTS NOTED.