Well......
the other day the drivers side door was stuck open. After jiggling it a bit it closed OK and this has reoccurred a couple of times. Took it into the stealer (Comm Motors, Phillip ACT) to show them and was told that there was a known issue with the check straps. It is booked in next week for inspection/repair. It isn't broken yet - if it does break the drivers side window won't unwind all the way.
Watch this space ......
Note: Happy with the response so far. The foreman knew exactly what the possible issue was and has a plan.