Toyota have a service bulletin to inspect bolts on some year models. This check can be done without significant component removal. Unfortunately, if a bolt is observed to be loose it is a 6 hour job to tighten them (some say engine must be dead cold) and possibly longer if the bolt has dropped into the Vee and needs to be found. Dealer checked mine today 50k/km service and said all ok and he said that it is rare that they find a car where they are loose. But there are some and that is why the check is being done at the service.
