Maytag SE1000 overflowed on the large load setting, worked on the medium and small although I suspect the water level was too high for those levels. After reading the comments here, thank you by the way, and some videos on youtube regarding other machines, pointing to the problem with a disconnected, clogged, or leaking air tube to the water level valve, I decided to remove the Air tube that connects the tub to the water level switch. Examining the inside of the tube, the sides were covered in slime and debris. I clean out the tube with a small tube brush and continually alternated between tapping the tube to dislodge the debris, brushing and rinsing the tube until it ran clear. Then I tested the tube for air leaks by plugging the large end with the palm of my hand and then blowing on the other end while the tube was submerged in water. No bubbles appeared. I put the clean tube back on the washer and tested the machine. That seem to do the trick. The large load water level stopped filling at the appropriate place in the tub.
Should I replace the air tube anyway (#22 in the attached) just to be safe?