Done some research today.

- oil out from tranny, it looks like coffee (!)
- oil filter out, it's real dirty but not that dirty it wont let the oil go thru
- control valve unit off, no broken springs or other failures
- side cover out, no major damages (what you can see on that small gap between tranny and chassis). There are lots of silver paste in the bottom of the transmission case. It might be on disc plates?

I think that next I have to remove the engine and check the oil pump... :(