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Did any of you find the source?

I have a very similar issue. Have removed the timing belt covers to replace the timing belt. The oil sump is sticky, mostly on the right side. There is some oil under the timing belt cover around the crankshaft but not too much, the belt is dry and well. It does not look like it comes from the crankshaft oil seal but from somewhere above to the front, somewhere behind the alternator.

EDIT: added pictures.

 

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I’ll reply to myself. Have started another thread also. The leak comes from the over-pressure valve. Next question is why there is overpressure, maybe some lines are clogged somewhere.