As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT NOT GROUNDED) (DISCREPANCY NOTED DURING AIRCRAFT HEAVY MX VISIT) DURING THE PREDOCKING PROCEDURE, AFTER THE DOORS BUSTLES REMOVAL, THE MECHANIC FOUND AT L1 & L2 DOORS THE LOCKING PIN PREVIOUSLY INSTALLED IN THE ESCAPE SLIDE INFLATE CYLINDER / REMOVED AND REPLACED PINS TO INSTALL IN STORAGE POUCH ON SLIDE"