Welcome to the forum.
The P0456 evap leak isn't a major issue and the van can be driven without a problem; it might just pollute a little bit more until it is fixed. It took two tries to get it fixed on my van. Here is a thread to read if you are interested. Posts 41 & 46 are what the dealer did to fix the problem in my van if you are out of warranty and want to check on fixing it yourself.
https://www.pacificaforums.com/foru...ight-help-please.html?nojs=1#goto_threadtools
I agree with @Waldo that batteries should be checked since low batteries can cause some unusual problems with the van.
There might be a software update for the sliding door problem. Double check to see if there is anything that somehow got in the space under the floor. I found a pencil in that space that rolled around and made some noise but didn't affect the door opening or closing. Recently my van's driver's side sliding door has started reopening when I get in the driver's seat if the sliding door hasn't closed all the way. I assume it is movement of the van that is causing it to reopen and will have it checked when it is in next time since this is a relatively new issue. Battery is new so that shouldn't be a factor for my van.
Just saw this post about TSB 08-027-18 for sliding door issues. If you take the info with you, it might help the service department fix the problem.:smile2:
https://www.pacificaforums.com/forum/568833-post4.html
In general it is better to try a forum search for solutions and to put problems in separate threads when possible.