I vastly doubt that - new screws always go in during a service. Both myself and David replaced them as a matter of course with no charge!
I'm not sure what you mean here: are the threads stripped (the screws just turn in the screw holes) or are the heads chewed up?
If it's the former, you will need new sled support brackets with good threads.
If it's the latter, you need pliers with 1cm jaws, and you can easily turn the screws by clamping onto what's left of the heads perpendicular to the casing.
New screws are available.