B757-300
Training / Qualification; Fatigue; Confusion; Troubleshooting; Time Pressure
Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Human Factors
[Crew] called [Maintenance] to help the Gate Agent close the door. I got to door 2L and the Gate Agent said the Pilot had a door indication problem. So I closed the door 2L from the inside and went to the cockpit to check for the indication and get a briefing from the crew. The Pilot Captain said a door entry light on the overhead panel was on. I confirmed the light was on. I made a log write up for that. I thought that if we cycled the doors real quick it would possibly clear itself. I then proceeded to cycle door 1L as my partner cycled 1R. We thought that the caterers might have not closed the door all the way that's why we tried starting from doors 1. I wanted to cycle door 1L as a precaution. I first cycled the arm/disarm lever twice. Once I proceeded to open the door it felt difficult to open so I pushed on the door with my left hand lifted the handle with my right. Then the slide deployed. I went to let the pilots know what happened and was then told door 2L indication had an issue on EICAS. I was rushing due to the plane being boarded and ready to push back. Since I was just opening and closing the doors I didn't use a checklist. I worked swing shift the night before. I got about 5 hours of sleep the night before.
[Report narrative contained no additional information].
Maintenance Technician reported while checking door operation on an aircraft inadvertently deployed the emergency slide.