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you book a service, let's say for rattle, or any other issue. and it is persistent for week or so. but on the day for the service, as typical, issue is gone and cannot be replicated.
Happened to me. Squeaky front suspension arm for weeks. Booked in and the day before the visit it disappeared. Luckily I had a recording of it and they were happy with the evidence. Replaced the suspension arm.