I have bought a 1999 Citroen Xantia and the advertisment said, "Full service history". However, there was no record of the cambelt being changed on the service history. When I aksed for a receipt the vendor sent me a copy of a garage headed notepaper saying that it had been changed last year but if thats the case I would have thought that it would have been noted in the service history. If I have the cambelt changed is it possible to have it checked to ascertain whether it is the original one or not?