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Arrange with your dealer to take the service manager for a drive so he/she can see the behaviour occurring.
Don't do anything else until you have done this, and keep pushing them until they do it and see the problem occur!
If the dealer doesn't want to do this, contact GMH customer service and harangue them.
Don't do anything else until you have done this, and keep pushing them until they do it and see the problem occur!
If the dealer doesn't want to do this, contact GMH customer service and harangue them.