I think if you are still under warranty I would call heartland yourself and give them your Vin # And see if they can find your match. I don't see why they wouldn't still have matching 2016 furniture. If they don't they should have to replace everything to match.
As for small warranty items. You can have your dealer do them but you'll find after doing that a few times you'll wish you would have just done it yourself.
Of course that all depends on what the repair is, how good your dealer is, and how close to home they are.
You will find answers to all of your questions here on the forum and a whole bunch of very smart and experienced people right here to help you.
If your new to the Forum you should check out my "Project LM 365" thread under Landmark modifications
Here's a link to the Index
https://heartlandowners.org/showthr...t-LM-365-Index?p=484400&viewfull=1#post484400
LET THE MODS BEGIN
Good luck
Jerrod