That problem goes way back to the early production models and Nikon did replace them for free. Now, though, there probably aren't any in stock since the N90s/F90x was discontinued 10+ years ago; if there are any at Nikon, I don't think it will be free. Replacing the door is the easy part; finding a NOS one isn't. The N90s/F90x is very cheap now--working or otherwise--so why not just look for another?
Originally Posted by destroya