904 Transmission Stopped Going Into Gear

I haven't read anywhere in here that you checked the ring wear surface inside the replacement direct drum. I saw lines in it in the pic. I'm leary because they incorrectly sent you a 3-plate; so if they didn't even check that, then they maybe didn't check the ring surface. If you can feel wear then it's no good and must be replaced. Unless you can use thrust washers to place it laterally so that the new rings ride on an unworn surface. But ring wear is usually pretty wide because it is caused by the direct drum wobbling. If you try to machine ridges out then the rings won't seal.