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I'd just monitor the car. See how it behaves over the next few days/weeks. If it's no different to what it was before then you've got away with it & lesson learned. If it starts acting up, not running like it was/should or you're conceded with anything, get it back to the garage and get them to do whats needed to correct.
Okay so 2011 GTI 30K miles.
Cant be bother to change my oil at this point in my life so went to a station. You know the kind you wait in the car while they do what they do. Long story short they left the coolant cap loose and two days later while having a spirited drive my car alarms for temperature and fluids simultaneously. I obviously pull over and after a few minutes of genuine confusion I fill it with water. I didn't make a huge litigious issue out of it because I figure good karma, waste of time, full warranty, etc.... They've flushed the coolant system and replaced the oil.
I suspect it was truly running hot (>300F) for only a few minutes because I only drove 5 miles to work and back, before it alarmed on the faster drive.
What would you look for and is there anything you absolutely replace? Spark plugs? etc?