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When a single key goes out, it's due to a worn out contact strip. They are what the key hits to send a signal to the tone generator. They are serviceable.
If you want to do the work yourself, it's not too hard, if you have some electronics experience. Unplug the piano and turn the power on to drain any residual power. Remove the screws from the bottom of the piano. Turn it over, and the top will flip up. Strike the key. See the little rubber pad that it hits? That is the part that needs replacing.
Roland Parts Dept:(###) ###-####/p>
If you would rather send it in for repair, click here.
Do you have any questions about the repair? It's a maintenance item, and a rather simple repair.