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Hello Piet.
Interesting pictures. As I can see from that you were pruning using crown head. So maybe it is possible you lost some live wood.
That could be the reason to have some access points of trunk diseases.
Anyway the sympthoms are not so clear.
How was the climate after the rain? Dry and hot?
For the black spot in the base of the shoot (pic2) I think it would be possible Phomopsis viticola symptoms.
Do you have some recent pics in other plants?