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Yes this is a door microswitch problem (or noid as renault call them) as you correctly say. However its intergrated into the door locking mechanisim. Before you replace this I would take the door card off and see if you can get to the lock. Then spray with WD40 or the like to see if its free as the switch may just be stuck.
Oh and welcome to the forum.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo