How many Kay's on the clock ?
Had to do a replacement brake switch on an Auto ES few months back it had all kinds of issues including not getting out of park. Everything you need including part number for the switch is below. The switch is the same on the auto and manual job
http://imgur.com/a/DmOYDdZIf you buy the genuine one from Mitsy your looking around $50
Buy the exact same unit from Hong Kong from eBay delivered to your door for about half price or even less.
Buy a few and throw them in your drawer for a rainy day