As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK IN FRA, THE UPPER DECK SLIDE WOULD NOT DEPLOY DURING TEST. FOUND 2 RELEASE PINS ON THE PACK BOARD LOWER HORIZONTAL BAR NOT PULLED. THE RELEASE PINS WERE ROTATED AND CAUGHT ON THE EDGE OF THE RELEASE PIN CAUSING THEM TO GET CAUGHT IN THE OPENING OF THE HOLE. REMOVED SLIDE AND INSTALLED NEW SLIDE IAW MM. (M)