Actually I got me an official workshop manual CD-ROM, but it doesn't run on any of my computers
. If anybody had a source for a new digitial or printed version that would be welcome - but all links I found so far lead to dead ends.
I don't think I damaged the gearbox, it shifted smoother than before and that ATF smell is also gone! Will measure it again and refill it if necessary.
BTW: I once had an old Opel with GM 3-Speed Automatic, one day it started to drop the gears when cornering hard or especially in roundabouts. We finally found that there were missing 3 out of 6 litres ATF! Gearbox is still alive. Don't have to mention that I had advised my mech to check ATF long time before.