Tell him to sell it. That is my advise to my friend who has a Megane.
If it is like the Megane the doors are prone to collect water in them. The speakers and the electric window motors often fail because of it. I suppose the door locking electrics could suffer too. IIRC it is the window seal that is the problem.
If that is the case it should be relatively easy to fix, but the door will need dismantling.
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