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I can't see it being a 'welded' nut (it wasn't very well secured if it was), but it does sound like a fastening of some description.
Door check straps fail fairly often (especially during high winds), so they are intended to be replaced.
I'm not sure how you will gain access for your specific car, but I would reckon on either through the wheelarch, or removal of the trim in the footwell.
More than likely there will be torx fittings involved to allow access, and if you need to go via the wheelarch - you will find it easier to remove the wheel to allow the removal of the liner.
Having a magnetic screwdriver will also be handy if the nut has fallen into a hard to reach position.
Hope my ramblings help you in some way.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater