The 2015 Apex SE, model code RX10PSFB, is documented in Yamaha part number LIT-12618-RX-04. That volume spans 2013 to 2015 and takes in the standard Apex and the Apex XTX as well.
Variants in this family are close enough mechanically that Yamaha wrote the procedures once, then flagged the differences in the specification tables by code and year. Read those qualifiers; they are the reason a shared manual can still be precise.
The work itself is covered from routine maintenance through to major engine service, with power train, clutch and track procedures, front and rear suspension adjustment figures, brake and steering service, and electrical diagnosis supported by wiring diagrams for the complete sled. Torque specifications and wear limits are stated as values at each step.
