Mine is an early black model. I've had it for six or seven years. It's a user. The bottom plate is showing some brassing as well as a small amount of brassing on the corners of the top plate. The black shutter release button fell off and was lost a few years ago. The brass post that actually operates the shutter release button is all that's left, although it doesn't really affect operation at all. It's recessed slightly below the shutter speed dial and my finger depresses the brass post just about as easily as the black plastic button that was once there. The glass is pristine.
Mine has had the sticky shutter button problem pretty much the whole time I've had it. For a while, I could make it work better by vigorously operating the shutter button (with no film in it) two or three dozen times. Then it seemed to behave for a short while or, at least, be better. I haven't used the camera much for the last couple of years because of the balky shutter button. I knew about the Alps switch replacement, but my soldering skills aren't that good.
Tonight, I discovered
this thread with the step-by-step procedure for cleaning the existing shutter release switch. I've had the top cover off several times contemplating a fix, but I've never gone as far as removing the small circuit board. I didn't know how to get the ribbon cable disconnected without damaging it. Thanks to the guide above, I found the plastic ribbon cable lock and easily removed it.
I proceeded to clean the switch following the instructions. Working carefully, I disassembled the switch and I immediately saw a brown film of oxidation, crud, or whatever covering the switch contacts. I carefully cleaned them. The two switch contacts in the corners are difficult to get to with a q-tip. The tip is too large to get into the corner adequately. I stuck a tiny precision slotted screwdriver into the cotton of the q-tip and twisted it several times, winding some cotton around the tip. Using that, I could reach the tiny pads in the corners.
All clean, I put it back together and it works perfectly!. Best of all, if I have to do it again in the future, it will be a 15-minute fix.