As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOMATIC DEPLOYMENT OF ADG OCCURRED AT ALTITUDE WHILE ENROUTE. NO ADVANCE WARNING OR INDICATION WAS GIVEN PRIOR TO DEPLOYMENT. CREW PROCEEDED WITHOUT FURTHER INCIDENT. MAINTENANCE CREW STOWED AND PERFORMED OPERATIONAL CHECKS IAW MM. NO DEFECTS NOTED. AIRCRAFT RETURNED WITHOUT ANY REOCCURRENCE. THE FOLLOWING PARTS WERE CHANGED AS A PRECAUTIONARY MEASURE.