I had 6 months warranty on mine and for first service at 20hrs I took it to a official shop. They just changed oil, lubricated it and that was it. From there on I did everything myself. For the first time you do something on it it might be a little tricky but you figure it out pretty quickly. I'm not sure what you can modify with that extended warranty though.
Welcome to the forum.
2016 Raptor 700R, Street legal, HID kit, 15T front, AIS delete, Jogaca suspension, Adjustable rear link, LSR 2+1 A-Arms, Axcalibar axle, PC5 w/timing and autotune, full Dasa exhaust, Talon 36T rear or stock 38T