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Hi there, and welcome.
I wouldn't think it is covered, as the warranty would normally cover against manufacturing defect (i.e. faulty metal/welds, or poor painting/treatments) - the fact that the car is 9 years old (and has therefore had 6 M.O.T.s, without even an advisory being issued), would indicate that there really isn't anything premature (i.e. occuring within the warranty period) about this.
I don't think its unusual for the same type of corrosion to exist on both sides of the car (I presume they are the original parts, and have given the same service?), water, debris, etc can build-up over time, and (especially) in hard to see places, can run riot.
You could probably be justified in stating that you think it to be a design flaw - but its no more a flaw than making a car from mild steel.
Better its discovered now, than at the aftermath of an accident.
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