Theres something else going on here..... 2k miles is to soon for a reoccurring fault. id assume that they didnt clean the EGR valve fully/properly, (last time) which is why the issues has come back so soon. incidentally the VW manual states that the EGR "pipe" should be "replaced" if its removed. . . . . which is why you see so many new shiny pipes. lets hope they do a better job cleaning it this time round.