Im not sure where it leaks, but its even hard to be called a leak Its only a little moisted. Crankcase is dry as Sahara. Damn, first gasser and such a bad luck.
Im not sure if i can manage replacing the bearings, if something goes wrong my warranty is gone. And then another engine? Boring breaking in? I think ill send it to my seller and let him worry about it- its his problem.

Edit:
i'm just back from my basement. Wanted to take off the engine and send it to seller. I feel like a fool, but on the oither hand im very happy There is no play at all at the main bearings, the only play is somewhere among the piston, connecting rod and the crank shaft. It is less than 0,5 degrees of crank shaft turn and as i know its absolutely normal.

Thanks for all for help!!