I had to bring my 2007 335i coupe to the dealer for a battery change and while inspecting the car they found a broken nozzle on the 2 turbo vacuum tanks (stock code 11652247620). First can somebody tell me how this can happen since this is a static item and secondly can I replace them myself? The dealership is asking $180 while the 2 tanks only cost $35 a piece. It looks fairly easy to change but couldn't find any detailed procedure. Anything particular to watch for while replacing them? Thanks a bunch for any info you might have.