You don't say what kind of car this is on, but I've had it happen to me.
2008 Cadillac DTS , braking was always fine around town, but on my first trip back from FL to OH, coming down the mountains of WV, the pulsation started. I thought it would go away by using them, but the warmer they got, the worse the pulsation became.
Looked it up on the GM website and sure enough, there was a recall. The recall only called for different pads, no issues with the rotors at all. New pads and next trip, all was perfect. I don't think they did a thing with the rotors in fact, no turning them down, nothing.
Possibly cleaned them with solvent, because the car wasn't in the shop for very long at all. I waited for the work to be completed.