As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FL 350 CRUISE (3 MINUTES AFTER L/O) M.787/AS 266 KTS.AIRCRAFT ON TRIM: A/P B UNCOMMANDED DISCONNECT RE-ENGAGED A/P B AIRCRAFT FLOWN NORMALLY REMAINDER OF FLIGHT TILL 1500 WITH NO OTHER PROBLEMS. AFCS BITE PROCEDURE REF FIM 22 11 00 810 801 CURRENT STATUS QUICK TEST PERFORMED AND PASSED.