Good chance it can be fixed for much less. Was it on when the juice got spilled? What happened to the computer? It can most likely be cleaned using distilled water. We need to know exactly which MacBook Pro you have to direct you to a teardown. Did Apple open it up? What did they do?
Use NON Conductive Component spray which you could find at Radio Shack and generously spray down everything internal including the motherboard and all surrounding components. Allow the MBP to rest in a well ventilated area for 1 hour..it did the trick for my 2010 Macbook Pro i7 which I made add is working perfect.