As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN PFD HAS FD DISPLAYED IN AMBER AND CAPTAIN F/D WILL NOT ENGAGE. GROUNDED - YES. PERFORMED INSPECTION BEHIND P18-1 PANEL WITH NO DISCREPANCIES. PERFORMED C/B CYCLE OF CAPT'S DFCS PER B737-800 AMM 20-60-05. PERFORMED GOOD LRU REPLACEMENT TEST PER AMM 22-11-34-740-801. PERFORMED GOOD LAND VERIFY TEST PER AMM 22-11-00-700-801. ALL REQUIRED LLM TESTS PASSED.