I highly suggest you download a copy of the TRX and DT 1500 manuals of the same model year for future reference. The TRX manual only mentions TRX-specific subjects and does not cover everything. They can answer a fair number of the questions you ask. For example, and in regard to your previous question, the TRX manual suggests the use of DOT 4 for "extended use".
The DT 1500 manual covers the brake service mode. It's readily accessible in your UConnect settings, no tools required. Unless you're on UC5 and have some bugged software not exposing it. Any shop could've installed those Powerstops, not calling you a liar, but having them on your truck doesn't imply you specifically installed them. And if you did do them yourself, then I would assume you would know of the brake service mode. You also previously stated you never worked with ABS before. Considering it has been commonly used since the 90s, I was assuming you never changed your brakes before. I did not intend for my assumption to be offensive.