I don't think I've ever been at a non-FS Marriott where they made the sofa-bed. We've always had to do it ourselves. Quite often though we have had to call to get the hotel staff to bring the extra sheets, blankets and pillows, but they have never offered to make the bed for us.

The only instance that I can think of might be at a FS Marriott that had turn-down service. We had the sofa-bed out, but not made yet when the turn-down service attendant came by and made the sofa-bed for us. But other than that, at Marriott's we have always had to do it ourselves.

Now, in fairness, I have to admit that I have never actually called the hotel asking them to make the sofa-bed either.