Valve cover seal leaks

Hello everybody, it’s time again, I was with my friend today, because I found a drop of oil under my moose from time to time. And look, half the engine protection cover is oiled, so we were looking for the oil source, the guess is on the valve cover seal. Cost point lappy 500 € happens more often than not? My moose now has exactly 106000 km down, and with the 100,000 inspection nothing of the oil loss was visible yet.