I have the Phantom 3 Pro. Where do I find how to maintain?

Start with the quick start guide, manual and release notes on the support page.

Hi,Donald.goodwin
Please check the user manual at that page : http://www.dji.com/product/phantom-3/download   
By the way , many valuable threads are posted in the forum .Guess you'd like that .

DJI-Patrick Posted at 2015-11-22 21:00
Hi,Donald.goodwin
Please check the user manual at that page : http://www.dji.com/product/phantom-3/d ...

Thanks for the info.

donald.goodwin Posted at 2015-11-27 13:23
Thanks for the info.

You can also check threads in the forum . We made a compilation here . Hope that will help you !