Up until a little while ago, I had no idea that my X-700 was designed so that one could view the current aperture through the viewfinder. Something seems to be lodged in the way of the mini-prism which has come loose, allowing a small sliver of light into the viewfinder (although the f/ number is still obscured). Is there an easy way to get at this part of the camera? I'm not looking to pay $30 for such a small function, but if it's only a matter of a few steps, I'd like to try and fix it myself.