The only person I know that encountered this lives in Richmond, VA and he left his keyboard in his car on a hot, summer day. The heat had deformed the key strip and he had to replace it. The strips sell for about $20 and they're not difficult to replace. The come in one octave lengths and fit in place above the contact strip. Keep in mind that everything in the keyboard must be handled with care, and if you have no electro-mechanical skills this is not a job to undertake. The shops usually charge about $75 plus the cost of parts to do this one.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)