OBERHEIM SYNTH

Hi,

I own a Matrix6 keyboard with 3 broken keys on it, but also have 
replacement keys.
Does anyone know how to remove & replace a (white) key from the M6?
I opened the M6, and it looks like you simply have to move the key a 
little bit forward and then lift it up at the end. But that doesn't 
work - the key won't lift.

Did someone replace a key on his/her Matrix 6 yet ?

Thanks,

///E-Synthesist