These folks can rebuild it for you. http://www.theremotedoctor.com/ They did a Sony remote for me and it works like new. It costs around 20.00. Or you can buy their kit and do it yourself.
I've done my own remote repairs with success. If it's just coffee you may be ok - just don't use it until it's cleaned and dried. I don't think you need to even order the Remote Dr repair kit - just follow their procedure.
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