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Hello, we are picking up a new to us 2018 SE tomorrow.

What system? Is it the 8" touch screen or the 4" non touch screen. Portions of your post hint at the latter. Unfortunately it seems like those systems are a bit more problematic. I'd try first pulling fuse 67 (not to be confused with fuse 79) which is for the Sync system itself. 79 is for the ACM which is a different set of issues. See if that brings it back at least temporarily. If not, you may be looking at hardware failures which is not uncommon with those. Most people just go to aftermarket headunits with those. It's often not worth the limited functionality the basic Sync system provides on those and having to pay the cost and risk it going out again. The 8" touch screen systems are a whole different beast. Usually Sync 3 units (2016+ model years) are rock solid. Older Sync 2/MFT hardware (2013-2015) is pretty ok especially once they're fully updated. Some hardware failures exist but aren't nearly as common. These are also easily upgraded to Sync 3 which I personally highly recommend if you can afford it. You get the benefit of a newer more reliable infotainment system and added Android Auto/CarPlay functionality from a fully OEM/integrated system. And it's virtually a plug and play upgrade. Semi-related comment: But for people shopping around for these vehicles, one of my main recommendations is going for one with the 8" touch screen infotainment if possible. Sounds counter-intuitive but they've gotten more attention and fixes over time compared to the 4" models.

Glad you found a great place to get your car repaired. I hate the mentality of just changing stuff until fixing the problem at your expense. Doesn't anyone troubleshoot anymore?

For me I've basically skipped refreshing the included tire kit/inflator. Ulterior motive for that being I found mine had an air leak somewhere and wouldn't get up past around 20 psi. Instead I just got a cheap tire inflator from the local big box store. Slime branded model that also has a digital pressure readout and auto-stop once it reaches your set pressure. Then just a simple tire plug kit to go along with it. Both are small enough to stash under the lip in the cargo area on my Energi and the old space under the passenger seat is now open for extra storage.