What to do/check when buying a used X1C

Been offered a second hand Bambu X1 Carbon with AMS. It's got approx 1300 hours on it and it's a few months old.

What do I need to check when buying it? Seller is happy to demonstrate a test print.

I'm new to bambu but not 3d printers. Are there any common issues or areas of wear to check out?

Does the seller need to unlink from his bambu account or anything like that?

TIA!