Very interesting information. On what date did the dealer do the work?

According to the latest ETK, your part number 84 10 9 132 711 was used for 10/2005 - 10/2006. There is actually a newer version and that is 84 10 9 115 729 which is spec'd from 10/2006 and on. Because the ETK is dated 8/2006 I have no way of knowing if anything newer than that exists. So at the least yours is 1 version old. It's good to know that it works better than the previous version (what is the build date of your car?).