What do you mean that the caliper pins were having issues? How did your dad even know they were having "issues"? Did he try messing with them? There's a lot of unanswered questions here for a vehicle with only 1yr/8k on it.
That being said, without knowing entirely what's the issue here... it's hard to say what the issue and/or "fix" was.
But, IF the issue was due to one or two wonky caliper pins (I've seen a few so it's very possible) then it should have been covered under 3yr/36k bumper to bumper warranty.
As for them being "serviced" well you're not really supposed to grease them, but taking a brass brush and knocking off any rust and/or crustiness they get on them and maybe using a pocket screwdriver to clean out the bore (or a small bore snake) if they're really crusty isn't a bad idea if you're doing brakes. Sometimes they can get bad enough that trying to pull them out doesn't work well; but in my area that's very rare to see in vehicles that haven't been around at least a decade and/or a hundred or more thousand miles. Maybe it's a bit more prevalent in rust belt areas?