I have a 2008 tourer with wiper problems although not the same as yours, mine is intermittent, works most of the time but then suddenly doesn't - usually when it rains. Fortunately I also have another one which I use when its raining!
I have had both motors out to check for corrosion of electrical contacts, nothing found, refitted the motors and it worked fine - for a while, now doing it again. It would be a lot easier to find the fault if they would pack up altogether but will eventually will check for a 12 v supply when they stop.
There is a firm that will repair the motors:
Somerset Technical services. 01460 78930. They are at Crewkerne.
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