This plan: Bent the flashing under that window to help it drain over a roof tile. Temporarily shoved a wad of plastic in front of the point that the water seems to get in. Let’s see how it goes, today brings rain, lots of it. The wood will take so long to dry out though, but at least we’re heading towards a slightly less wet part of winter. I put the heating back on up there and am running a de-humidifier to grab what is probably condensation.
Some useful stuff on the web:
After the rain: I could see water trickling down the rafter. My efforts to bend the flashing onto a scoop shape failed. At least they did with the very heavy rain we had this afternoon.
Is there a good roofer onboard?