There is a thread at 
http://www.eevblog.com/forum/product-reviews-photos-and-discussion/racal-dana-1992-teardown/
 that has some detailed pictures of the innards of the switches, by the look of 
them a rubber keypad repair kit should work.

http://parts.digikey.com/1/parts-kws/conductive-rubber-keypads-repair-kits

Sam

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