Oh, I have taken tops off of these a multitude of times, usually to clean a dirty viewfinder area.
No, Brian, I do not think that it is an ASA situation but, instead, simply the light sensors dying and, somehow, the linkage between shutter speed and meter remaining intact. I did not expect a quick answer here but wanted to see if anyone else had had this problem and had came up with a relatively simple solution.
Chan Tran, that is a VERY handy website you offered.
- David Lyga