update:
Been to the garage but they can't tell without taking the spoiler off whether it's water damage or damaged wires (apparently a common fault on tourings).
However, removing the rubber wire cover from the glass panel revealed a bit of corrosion and I now have the car booked to sort that and investigate next week.
As the corrosion seems to have been there for a while with no visible signs it is probably a good idea for other touring owners to investigate theirs as well.
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