Short update to close this file, came back from service today,
223 usd, they did:
-brake fluid check
-clean brake calipers
That seems pretty cheap considering what a pain the filters are to change and how you would need to remove the rear brake calipers from the car to clean and grease them properly. I wonder if they really did a complete job on the calipers, or if they just sprayed them on the outside with compressed air and called it done. You never know unless you take them apart yourself to check, or watched them do it. Here's what needs to be done.