How to Troubleshoot & Replace Ge AP2039841 / WD22X155 Lower Spray Arm

During cleaning found the two black rubber gaskets at the bottom of the door were broken. As cleaning progressed, decided to order new door vent and lower spray arm. Had no problems replacing all parts. Excellent videos and parts catalog were a big help. All clean and working fine. 

Again after a lot of research on line, I was able to find the information regarding how to remove the old spray arm and replace it. I called the applianceParts Pro and ordered the part just after noon one day. By noon the following day, I had the part in hand. Unscrewed the old assembly and screwed in the new part . The dishwasher runs great now. By the way, I am 76 years old and the hardest part of the process was researching and of course getting down on the floor to remove and replace the part.