Found the one MWO that was missing in my previous post. I wish I could edit my last post to include it, guess one of the admins will have to instead.

MWO 9-2320-272-24-1: PUB DATE 09/21/1991; MODIFICATION WORK ORDER - MODIFICATION OF 5-TON VEHICLE M939A0/A1 SERIES TRUCKS SPRING BRAKE CONTROL VALVE IMPROVEMENT

The reason we don't have access to some of the TBs is because they are not cleared for general public access due to the nature of those particular TBs.