Had a new windscreen from Autoglass yesterday via insurers, seemed to be fitted ok, but not original type glass - original appeared light green tinted, this appears un-tinted, but not a massive issue as it seems a decent panel. They refitted the wiper rain sensor by the mirror (although not tested yet as I was warned not to wash it for a few days - hopefully not pre-curser to the leaking bonding well reported by BBC Watchdog) and they didn't make a mess inside.
However ever since the new screen has been fitted, the alarm has been going off intermittently (including in the early hours). Never had an issue with the alarm before, in fact I've never heard it go off before! Obviously they've damaged or disrupted something, I presume it's nothing to do with the glass colour or needing recalibration (especially during the night), so are there any sensor wires in the pillars that may have been damaged, or does the alarm just reside in the centre of the roof?
Any thoughts and how to approach and get repaired as I'm obviously not keen on Autoglass messing about with the electrics, would rather use BMW; but equally want any damage to be covered by them.