I had the same problem on my 2.7 crd and it was broken wires in the DRIVERS door between the door and the body. I know it sounds strange but it was the wires that go from the drivers door switch panel that had a broken wire in it.
If the wires in the drivers door are still original it may be cheap insurance to replace them all ,one by one to make it easier to get the correct wire .
What worked for me was cut and solder each wire close to the plug in the flexy rubber and run it back to inside and join inside behind the kick panel.
It can be a pain to do, and it is tempting to only replace what you think is broken, but the other wires will break in time.
I used the most flexible wire I could get my hands on because the original wire is not all that flexible.
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