1.5M? Awesome! You have expanded memory...
As for the keyboard, I've heard using some contact cleaner and "working/exercising" the key can help..
I have a dead key on mine, but it's the caps lock, so not a biggie..
I've tried cleaning it, but nothing so far (well, I got several other keys working/working better).
At some point in time, I'll try desoldering it, taking it apart, and cleaning it that way...
Just got a hot air/solder work station for Christmas, so I should have a better chance to not ruin it.. ;-)
desiv