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Water getting in through front door frame.

When there is a heavy northerly we get water leaking through our front door frame. We have an early 1900’s home. The flashing looks ok but the weatherboards could potentially be the issue but is hard to tell. I have tried my best at using sealant on any cracks or joins. But still seems to leak. Is hard to tell where it is coming from. Doesn’t appear to be from roof or much higher as there is a window above the door on the second story. Can’t find any rotten weatherboards but my ladder isn’t very tall. You can see in photo where the drips are forming from. Is only in a couple of isolated areas.