Power Steering problem on 2005 GMC Yukon

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Difficulty turning to the right. Mechanic says the steering box needs to be replaced. Now he says the steering doesn't lock and says he can't work on it safely but claims he's working on a fix. I have heard that GM removed the steering lock from 2002 and newer models. Is this true and is it straight-forward to work on this problem without the steering locking? Thank you for your help.
(1) Answer
You are correct, the steering wheel no longer locks on most new GM vehicles. There is however a spot in the steering column to place a special GM tool to lock the column in place. It would be possible to fabricate the necessary pin, perhaps that is what your technician is working on.