Yamaha's manual for the 2019 sleds is LIT-12618-03-55. The L-TX LE it covers is coded SW1NLLKY, and the same book serves the B-TX LE 153, L-TX DX, L-TX SE, M-TX LE 162, SRX LE, X-TX LE 141 and X-TX SE 141.
The 2019 range is smaller than 2018's, and the manual reflects that with less cross-referencing between models. Where a figure applies to only some of the seven, the model code appears with it.
Sections cover periodic maintenance and adjustment, engine removal and overhaul with service limits and torque specifications, turbocharger and fuel-system work, electrical diagnosis including fault codes and test values, clutch and secondary setup, suspension and track adjustment, brakes, steering and the full wiring diagrams. Confirm the code on your sled against the one above; a 2019 L-TX LE and L-TX SE sit close together in the range and are distinguished cleanly only by code.
