As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN IN NAVIGATION MODE, ACFT IS BANKING 30 DEGREES PLUS AT HIGH ALTITUDES. DURING LEVEL TURNS, IT IS LOSING UP TO 75 FEET OF ALTITUDE. PERFORMED FLIGHT FAULT REVIEW OF DFGC 1 & 2 FOUND MULTIPLE FAULTS FOR PMS & FMS NAVIGATION DATA IAW AMM 22-01-05. RE-LOADED FMS NAV DATA IAW TC 34-040-003. RTS TEST OF BOTH DFGC'S SHOW GO IAW AMM 22-01-05.