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Provided that you're not diseased in any way, tell the 'Genius' that you spilled a bowl of beef stew on your MB. That would account for the smell and they may actually attempt to fix it.

The best MB horror story that I've read so far involves some long shot from a female during sexy-time. I seriously doubt anyone will top that.
 
that MB has to smell so ungodly by now. note to self: before a long night of uninhibited drunken debauchery put macbook in backpack
 
This is a pretty epic story. I doubt it would be covered by applecare, but I would call anyway. It would be worth the time just to hear the receptionist's response 🙂 .

No. They can see liquid damage easily. Liquid damage not covered.

To have a chance to maintain warranty, OP might need to buy a new top case from third party and install it.
 
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