I would not think that the racks are viable to repair as they are reasonably cheap anyhow. don't forget the gears may be worn in the shafts, or the bushes in the rack centre shaft may be worn. The racks are quite easy to remove, just may need a second pair of hand while you are bolting the new one in.
Also a good chance to clean the rack, paint the mounting brackets, replace rusty bolts etc.
I think I changed mine in about a hour, just a bit fiddly to withdraw it out from between the body and subframe. Oh and remember to centre the steering wheel and the front wheels as best you can. Try not to lose the centre position of the steering wheel because of the rotating electrical connector for the horn and Airbag need to be centralised when putting it all back together.
Sundance