No answer to your question but I have the same type of situation. Under one of the bedroom access points, there should be another dipstick and tube on the transmission. That is the one I have used in the past when I changed my filters and fluid. Also, when warm and level, you should be able to check the fluid level from the keypad. If you press on the up and down arrow shift keys at the same time, it will go into the fluid level sequence. You can go to the Allison site and download several manuals that are helpful to your situation. Ours doesn't have a dipstick there either and I even ran a camera down into the tube to see if it had come off the handle. Hope this may help. Happy Trails Bert