well if you snap off the LED it's still salvagable, you can easily de-solder it and re-solder another LED back on. or use the LED that comes with the key fob you bought off ebay.

The funny thing is, that all the used KR55 keys on ebay have gone up in price to about $75-$80, so it's really not worth rebuilding a key, when you can buy a new one from the dealer for $120