Darren,
Is there any way to remove just the A key that's giving me the problem and get to the contact(s)???????
Looks like a pretty big project removing the entire keybed.
I cleaned the contacts at the connectors of the wire's running from the soundcard to the upper right panel and installed the stick on clip and zip tied the wire's down. I hope that was the problem child. So far 3 boots and both channel's are there.

If I can't get at and clean just the contact that is giving me the problem, can you provide me a little more detailed information from start to finish of removing the entire keybed? That would be a big help!
Thanks.
Jim