1987 740 Turbo with M46

A couple months ago I noticed that the OD was having issues disengaging after I had been driving with it engaged for more than 5 miles or so. I drained the trans fluid and filled with type F ATF, and have done so a couple more times just to clean things out (the old fluid I drained the first time looked like it had been in there for a while). I was driving on the highway the other day and had the same OD issues. I got under the car to have a look see and noticed that I have a trans fluid leak. Since I was a 2 hour drive from my tools I took it to a local shop to have them top off the fluid.

Still had the same shifting issues on the drive home. When I got home I drove the car up on ramps and checked the fluid level. I ended up putting almost half a quart of fluid in before the fluid level was up to the fill hole. Is it possible that the garage did top it off and the fluid was still that low when I checked it?

I can only think of two things that could make the fluid level lower when I checked it than when the garage did.
- the OD engaging and disengaging
- the car being tilted up on ramps instead of being lifted on a 4 point lift at the garage

I have driven the car about 150 miles since filling it so I don't think the leak is bad enough to leak .5 quart over a 2 hour drive. Just wondering if I paid this garage $20 to do nothing other than move my car from one place to another in their lot.

That post was a lot longer than I intended. Just trying to figure out if I got ripped off or not. I am about 99% sure they did not do anything, but figured I would ask you guys.