Depending upon how the axle is laid out, there may not be much he can do to the diff without some special tools.
In particular, I'm thinking about whether the diff and pinion housing comes out of the front of the axle complete, or whether the crown wheel comes out of the back, leaving the pinion in the axle.
I suspect the computer excuse being given is not the truth, but, he thinks you'll buy it, and take the car elsewhere.
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