Hi kr0nique,
welcome to A.org...
The machine may have had coffee (etc) spilt on it in the past and liquid may have squeezed into the inner membranes inside the keyboard pad...this is a fiddly job, but i have managed to disassemble a keyboard set up in the past, so it`s not rocket science...
If the keyboard looks fairly clean, then it maybe that the cable/socket that the keyboard fits into the motherboard has worked loose...just a case of reseating it.
To open up the amiga case, you need to undo the screws (under the seal as well) and flip open (there`s plastic hooks at the back ) like a laptop...
While you've got the case open , you may notice some of the chips are in sockets, go and push each one to make sure that they haven't worked loose as well...and note down any MoBo details, serial number ,revision number etc...(for future reference)
