A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH DOOR L2 ESCAPE SLIDE REINSTALLED ON DOOR AND TESTED. REQUIRED FAA INSPECTION WAS NOT ACCOMPLISHED.

Narrative

A CUSTOMER SVC AGENT REOPENED THE L-2 DOOR AFTER BEING ARMED FOR DEP. THE EXTERIOR DISARM MECHANISM FAILED TO DISARM THE SLIDE. THE SLIDE FELL OFF FROM ITS HOUSING AND LAY AGAINST THE FORWARD EDGE OF THE L-2 DOOR FRAME FACING AFT. THERE WAS NO SIGN THAT THE DOOR ASSIST BOTTLE HAD BEEN TRIGGERED. THE DOOR WAS PULLED OPEN AND NOT FORCED FROM THE CLOSED POS. I INSPECTED THE SLIDE FOR ABNORMALITIES AND REINSTALLED THE SLIDE ONTO THE DOOR. THE GIRT BAR HOLDING BRACKETS WERE GUMMED UP RESTRICTING DISARMING THE DOOR FROM THE OUTSIDE. THE TRACKS WERE CLEANED AND THE ARM/DISARM MECHANISM TESTED FOR PROPER OP. THERE WAS MUCH COMMOTION OVER WHO WAS TO BLAME FOR THE DEPLOYMENT OUTSIDE THE L-2 DOOR ON THE JETWAY WHILE INSTALLING THE SLIDE. WITH THE FOCUS ON MOVING THE PEOPLE; I FORGOT TO HAVE THE REINSTALLATION OF THE SLIDE INSPECTED. THE ACFT DEPARTED FOR ZZZ1. AS SOON AS I REALIZED THE ERROR; I PHONED MAINT CTL TO EXPLAIN THE SIT. HE CONTACTED DUTY MGR WHO DISPATCHED A DESIGNATED INSPECTOR AND MECH TO ACFT IN ZZZ1 TO MAKE THE SLIDE INSPECTION.