These MacPros are made in China and don't like Russian vodka. You would have been ok if you spilled rice wine on it.
There are little white dots strategically placed around the keyboard, RAM ports, and logic board area. If the white dots turn pink that means they have triggered and Apple will know you liquid damaged the unit. If you can remove all signs of liquid damage, then just take it into the Apple store and have them mess with it under warranty. Worst they can say is no.
There are companies on e-bay ranging from $150-$400 that will repair Russian Vodka spills on MacPros. Purchasing a new or working used logic board is currently cost prohibitive, so best bet is to get the logic board repaired.