Welcome to the group - a lot of excellent information can be found here.
I would recommend that any of the smaller repairs that you can do yourself - just
do it and be done with it. By the time you haul it in to the dealer, leave it there
for Lord knows how long, and pray that they actually repair it properly you would be way ahead of the game to do it yourself. Since it is used, the warranty may be long gone anyway.
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