Flight Attendant reported a cabin door disarming issue upon gate arrival which involved a call to the maintenance team. The escape slide was not deployed but maintenance depleted the nitrogen gas in order to open the door.

Narrative

On this flight; I was responsible for the 2R door. We arrived at ZZZ and the seatbelt sign came off. I got up and the FA (Flight Attendant) who was responsible for the 2L door turned the aft galley lights on and we both turned to the door we are responsible for. I followed the normal door disarming protocol and disarmed the door and checked the disarming indicators.When I turned around to cross check 2L door; I saw the FA who was in charge of it was holding on to the door operating handle which was partially in an open position. I also took notice that the arming lever was still on armed position. At the moment; as I understood that she was putting all of her weight onto the door; my first fear was for her to lift the pressure on to the handle and gets thrown out of the door as the door opens. Also it was unclear if the slide was deployed; so I was concerned for the ground crew's safety as well. At the moment; I decided that the best course of action for me is to assist her physically while contacting the Purser for further instruction.I managed to talk to the purser via the galley interphone and informed the situation. He then spoke to the captain who spoke to the maintenance team. I was eventually requested to keep holding onto the door opera handle until the team arrives.Probably 20-30 mins later after the passengers deplaned; the Maintenance team came onto the plane and took over the handle physically. I was asked to monitor at the pressure gauge which was slowly going down and I did so for a while until someone else took that over as well.They told us that the slide had not gone off and what (I understood) they're going to attempt to do is to deplete the nitrogen gas so they can open the door without activating the slide.Eventually; they told us that they managed to deal with the situation without having the slide to go off.