No no no! The service menu was used a few years back when we didn't have all the options we have now. So don't bother with that.
Here's the simple way:
To correct the sticks positions: Go to "system menu" (double click "SYS") --> "H/W Set" --> "Calibration". Then follow the on-screen instructions and you'll be good to go.
To remove the "throttle-not-in-the-bottom-position" warning at startup: Go to "linkage menu" (double click "LNK"), --> go to the second page and click "warning", then scrol down to "THR POS." and change it to "OFF". That's it.
Hope that helps