First off.. the part came in less than 2 days! Fantastic shipping policies!
Changed the ECS switch out, from the bottom of the unit.
Had to disconnect the water, power and pull the entire unit out to access the bottom panel, but otherwise not too difficult. Whole project took about an hour and just needed a couple screwdrivers and a wrench (for the drain line).
Found great youtube video (sorry lost the link) on how to disassemble this dishwasher model, so that really helped know where all the screws were located.