As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING EMERGENCY SLIDE DEPLOYED. THE AMT INVESTIGATED A VERBAL REPORT FROM THE INBOUND CREW THAT THE PLASTIC COVER HAD FALLEN OFF THE LEFT OVERWING DOOR RELEASE HANDLE. IT WAS DETERMINED THAT THE HANDLE GRIP WAS ROTATED 90 DEGREES FROM ITS CORRECT POSITION. THE AMT THOUGHT HE COULD TWIST THE HANDLE WITHOUT DISTURBING THE RELEASE HANDLE. HE HAD NOT DISARMED THE SYSTEM. THE SLIDE BLEW.