Good questions, all, and in a way they are related to the big picture on the Neptune. The reason for the wax motor failure in a lot of cases was from using the wrong detergent. Let me justify this:
With a normal detergent, there will be excess suds. The teeny electric pumps wil suds lock on you and not drain the water from the tub. Unfortunately, the machine control board is also monitoring the water level and motor RPMs the whole time, and it picks up on the load changes during a high sudsing event. What results is the machine control re-rinsing the load over and again in the #3 rinse until the suds are gone and the load matches the prescribed water level. All this rinsing doubles the time the door stays locked and the pump runs. Hence an early failure of the wax motors which they never tested for such situations in the lab.
The only real testing on the Neptune was done in a small town of 900 or so people on Bern Kansas. Maytag went there in 1995 and replaced everyones machine with the Neptune MAh3000. After one year, Maytag and CBS news went out there and did a news expose about how the town saved 58% on their water usage and 40% less electricity than with their topload machines. Very cute but not really a quality field test. It would be interesting to go back to Bern and visit the junkyard today.
With class action suits looming in the future, Maytag redesigned the MAH5500s in 2001 to exclude the wax motor and added line protection to the motor board. Too bad they fizzled out just as they got the bugs out.