This was a pretty easy fix. Removed the screws around the perimeter of the inside cover of the door and pressed the outer door cover upward to release it from slots retaining it. There are four wires to remove (2 for the detergent door release and 2 for the rinse agent release). Removed the 6 screws retaining the dispenser assembly and inserted the new one. Reassembly is simply in reverse order.
Problem solved for less than the cost of a service technician's call!