the xb's maintenance manual says that every 15,000 miles that the drive shaft bolt should be tightened. but I don't know where the bolt is, or what the torque specs are. a mechanic friend was surprised that that was a listed maintenance task. can anyone tell me how to do this myself, where i can find directions? edmunds.com has explanations of all the tasks listed in the manual, but for this item the explanation is left blank.