A new door seal (AP3768902) was ordered.
Remove the old seal by pulling it from the channel where it is inserted.
Clean the channel using a small rag dampened with WD40 and a flat screw driver or flat wooden stick.
Push the rag around the channel with the screw driver to remove residue. Be careful not scratch the metal in the channel if using a screw driver.
Measure the new seal and mark it's center.
Observe which side faces out by looking at the old seal.
Start the center of the seal at the center of the door latch and push it into the channel working
from the center to each end.
Stretch it slightly as you install it, so that each end terminates where the old seal ended at the door contact area in the bottom of the dishwasher.