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I think I remember reading that this is a side effect of softmodding.
Where did you read that garbage?? I've never seen, nor heard of such a claim.
Sounds like your shooting in the dark, hoping you assumption will be true.
There is no way a soft mod can ruin a dvd drive. Its completely unrelated. Bios corruption, due to the inadequacy of users is possible, but nothing dvd related.
Xbox's, as well as ps2's are known for its dvd drive issues. In the case of the xbox's, thompsons are a known culprit.
simply clean the lens, or buy a new drive. Those are your options.