As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CONTROL SYSTEM MESSAGE OCCURRED IN FLIGHT. PERFORMED EXTENSIVE TROUBLESHOOTING, & CHRONIC SYSTEM REVIEW. MANY UNITS PREVIOUSLY REPLACED BUT PROB NOT ENTIRELY CORRECTED. REPLACED POWER SUPPLY ASSY & ACE L-1 A SECOND TIME. ALL TESTS PERFORMED WITH GOOD RESULTS, A/C RETURNED TO SERVICE.