Noisy lasers are incredibly common in 'older' consoles. They do this both with/without a chip installed, so that's hardly conclusive. The sounds are definately the laser unit trying to adjust and focus. IF it cannot focus quickly, the sounds multiply.
I wouldn't sweat it guys. Since it happens with originals as well, what can you do??? Just the usual... keep the laser clean, and make sure your originals/copies are in good shape.
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Oshawa modder... up there in Canada.