http://www.xoutpost.com/bmw-sav-foru...ictures-3.html
Post #27 shows the update.
http://www.xoutpost.com/attachments/...b-11-01-07.pdf also pdf added which also follows the thread above.
There is an update from BMW for the heads that changes the CCV from internal to external addition within the hose.
Maybe you already had the update completed on the one side?
Any records from the PO?