I have been reviewing a lot of service records for gtrs for sale. There looks to be a pattern of major works and rebuilds often involving billet baskets, forks and big overhaul. These are 2009 10s cars. Mileage vairy but some as little as 55k. Is this a thing or is it just the stage 4.25s? And bigger power gtrs. The service record are very good on some of these cars. Stay clear or is it OK now the gearbox has been worked on?