What was found
MDIS 851 52-10 0202 15JUL19 DEL OPEN U DURING PREFLIGHT CHECK, L1 DOOR SLIDE DEPLOYED. DURING PRE FLIGHT FOUND L1 DOOR HANDLE NOT FULLY STOWED DOWN IN OPEN POSITION. CLOSED L1 DOOR FROM INSIDE AND SAME WAS LOCKED NORMAL. WENT TO VERIFY L1 DOOR INDICATION IN COCKPIT FOR ARMED POSITION AND ANY WARNINGS / STATUS / EICAS MESSAGES, ALL NORMAL. WHILE OPENING BACK ARMED LEVER STAYED IN POSITION & L1 DOOR OPENED, DEPLOYING ESCAPE SLIDE. ESCAPE SLIDE HAS BEEN DEFLATED AND REMOVED FROM POSITION ( L1). REASON CODE : REMOVAL FROM A/C ONLY **NO INSTALLATION** OFF MPN: 62771-123; CPN: 2521556; SRL: 2547; TAG NBR: E77478 RELEASED FOR SERVICE PER MEL : 52-11-01-02 CATEGORY : C EXPIRATION : 25JUL19 L1 DOOR SLIDE/RAFTINOP. 10 MAN RAFT INSTALLED. IF SLIDE / RAFT TO BE RETAINED ONBOARD, THEN PRIOR TO EACH DEPARTURE MAINTENANCE MUST VERIFY SLIDE/RAFT STOWED ACCORDING TO PROCEDURES. DOOR MOUNTED ESCAPE SLIDE PACK REMOVED FROM AIRCAFT & PLAC DOOR/SLIDE RAFT INOP PER MEL. 10-MAN RAFT INSTALLED ONBOARD PER MEL REQUIREMENT.