Which one do I have?

Hey everyone. I've got a MacBook Pro with water damage and it wont power on.

I've opened it up and it doesn't look that bad. I was thinking of replacing the motherboard and sending the water damaged one out for repair as the owner needs it back fast.

I was wondering how i can find out exactly which motherboard i need without turning it on. Thanks!

I could have sworn i replied to this. You guys were absolutely right, the keyboard was shorted. Cleaned it up reinstalled and it fired up without problems. I should say the the replacing the logic board idea came from apple quoting a ridiculous price to replace the motherboard after a diagnosis by a apple technician. Even though my original question suggests something else. Props where props are due and i believe they are due. You guys helped me save the owner a serious chunk of money and for this i am grateful. Thanks again!