What was found
L1 MAIN CABIN EXIT SLIDE DEPLOYED. RELEASED FOR SERVICE IAW MEL 52-11-01-A CATEGORY B EXPIRATION 10DEC13 MEL 52-11-01-A L1 DOOR SLIDE MISSING IDENTIFY INOPERATIVE OR MISSING. ADDED MPN D30654-122 CPN 2520951 QTY 1 SLIDE UPDT 07DEC13 19:01 GJT R AWAITING SLIDE ASSY. MC1 R MEL EXTENSION GRANTED FOR 1 DAY NEW EXPERATION DATE IS DEC 10 2013. ATTEMPTED TO INSTALL A NEW ESCAPE SLIDE, L1 DOOR POSITION. HAD TROUBLE GETTING THE GIRT BAR TO PROPERLY INSTALL PER M/M 26-66-01-4. RAN OUT OF TIME DUE TO NEEDING TO PREFLIGHT & DEICE THE JET. REMOVED THE NEW ESCAPE SLIDE SINCE IT WAS NOT FULLY INSTALLED.REINSTALLED COVER PER M/M 25-66-01-4. INSTALLED A NEW PASSENGER DOOR EMERGENCY POWER RESERVOIR BOTTLE UNDER WRI 52-20-0764. REMOVED AND REPLACED L1 DOOR SLIDE ASSY IN REF TO B757 AMM CH 25-66-01-4, OPS CHECKS NORMAL. PREMATURE REMOVAL/INSTALLATION OFF MFG D30654-122.