Any help is very much appreciated. Just acquired this lift. Serial number is N511267. When started and in neutral, sounds like the back up alarm sounds for a second or two then stops. No sound from tranny to start, then as it runs for a minute or two, it sounds like it is *** air from somewhere. If you run it long enough, it will stop engaging into forward or reverse and then "catch" as if it is finally able to find the fluid. Fluid is in range on the dipstick. No tranny leak. Fluid is very pink. 1803 hours. Runs great. Thanks so much.