It was the door catch on the door that was damaged.
I asked Nikon the price of such repair when I was collecting my film scanner after a cleaning service, and they quoted me $45. I'm a little surprised that it is not as expensive as I thought, so sent it in and got it replaced with a metal one (15min job). Come to think of it, a little on the pricey side but since my wife (owner of the camera) don't mind, its okay.
Thanks Tetrode for the info.