As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRST OFFICERS FLIGHT DIRECTOR FAIL DURING CRUISE FLIGHT. THIS ALSO RESULTED IN AUTO PILOT DISENGAGEMENT. THE FIRST OFFICIER'S FLIGHT DIRECTOR CAME BACK ON AFTER APPROXIMATELY 25 MINS. GROUNDED - YES. PERFORMED LAND VERIFY TEST REF B737-800 AMM 22-11-00/201FOUND ALL TESTS TO PASS W/ NO FAULTS NOTED AT THIS TIME.