Found on the Acadia forums!
Originally Posted by JimDandy
Groovy. It was in GM Messenger yesterday. The message header is "09/20/2007 07217A – Customer Satisfaction Program Transmission Software and Calibration Update." It was there and no place else yesterday.
Today, it can be found in SI which is a database searchable by keyword against a make/model or in GMVIS which brings up info on a specific vehicle by VIN. Easiest way to find it is to look under "Campaigns" in SI. Oh, and it does have the "A". With regard to 07217A, "THIS BULLETIN IS BEING REVISED TO ADD 2007 GMC ACADIA AND SATURN OUTLOOK MODELS AND TO CORRECT THE LABOR TIME. PLEASE DISCARD ALL COPIES OF BULLETIN 07217, ISSUED AUGUST 2007." The "A" identifies it as amended. The original bulletin was for the 08's only. Lets not get hung up on the "A". If you get your vehicle flashed it will be the correct one.
Bulletin "07217A – Customer Satisfaction Program Transmission Software and Calibration Update" has a Document ID# 2015826.
With a little luck and a case of beer I should be able to get mine flashed out the back door just before quitting time tonight. Job pays .8 hrs.