LIT-12618-03-91 is the 2023 manual, and TRT4NPB is the code carried by the Transporter Lite 2-UP of that year.
The book serves the 2-UP together with the standard Lite, the SXVENOM and the SXVENOM MOUNTAIN, all for the 2023 model year alone. That keeps the specifications precise while still documenting the whole closely related group in one place.
A sled carrying a passenger sees different loads through its suspension and driveline than a solo machine, so the specified torque values and service limits are worth following exactly rather than approximating from a similar model. The manual gives them as figures, along with the maintenance intervals, the wiring layout and the diagnostic sequences Yamaha's technicians use. Check TRT4NPB against your machine first; the Venom and Lite codes are easy to confuse.
