I’m not sure, but I believe it triages based on the symptoms you select when you try to schedule something. Others will be able to confirm or deny.
I need to get the S serviced before the extended warranty expires (soon) and it’s down in Kingsville most of the time, but I’m sure what I need done requires a visit to a service centre. I’ll be swapping the S for the Y in the next couple of weeks, so if you see a white one around town, that’s us.