I have a 659 that has a button that does not work. I tried to disassemble the remote to clean the contacts. Took out all the screws, but it was not obvious why it would not come apart. I didn't want to force it and end up doing damage. Is there anywhere online that has an exploded view of the remote or does it just pop apart after some prying? I found three screws to remove... is there something I'm missing? Thanx for any help!

Kelly