I never looked at the TSB honestly. II found the bypass issue during my research on the GM trucks. Looking into known issues. From what I have picked up the Bypass is on all the 6 speeds from 2014 to 2018. Just slide up under your truck and check. They are on the driver side of the tranny. You can't miss it. 2 lines coming out going to the front cooler. It's a very simple job. But if it isn't broke don't fix it maybe? If you tranny is operating fine and your temp is good, either it's been done already or you don't have the issue for some reason. I'm very ****** about all these little quirks. I try to be very proactive. Way to much money tied up in these rolling tin cans. There are a few options. Some do the "pill flip" where you take it apart and flip the plunger over. I don't like that option. It blocks flow. You can get an OEM replacement or the Superior Solutions kit. I went the kit route. I can't deny the results. Tranny went from 195 normal operation, not even pulling, to 145 normal operation. If you go with the kit also order the seal just to be extra cautious. GM part# 23135703. The lines have o-rings also which could break while working on them. Not sure on your mechanical abilities. Or what kind of garage you have. The spring clip on our fluid lines are called "Jiffy-Tite". They can be a royal pain to deal with doing it old school. Plus you can easily lose them. If you want to make easy work of those lines get the tool. There are endless options. Ranging from $5 Chinese plastic garbage to $9000 Snap-On. You know what I mean. I went ahead and went middle of the road and got this. Lisle 22990 Jiffy-Tite 4-Piece Low Profile Disconnect Set. About $70 on Amazon. Not necessary but sure makes quick clean easy work on all the different connections on our trucks. And now I have another tool for my collection.
Shout if you need help.