I would NOT do the tech route...throwing good money after bad. Just decide for yourself that you're willing to get another one if you need to, then try to clean the lens.
You can also try a different brand of media (disc) to burn in it, and also try setting the speed lower. But sounds like you're going to have to do the lens cleaning routine. No guarantees that will work, either.
Some people recommend using an alcohol-based solvent on a q-tip. I'd just go with a low-tech solution, and buy a can of compressed air. Open up drawer, stick the skinny red straw that attaches to the nozzle of the air can inside, and give short bursts in various places to try and dislodge some dust.
If that doesn't do it, you can always take the cover off the thing and try to clean the lens itself with some solvent, and definitely one that's not going to leave any residue.
They also sell those cd disk cleaners that have a little brush on the disc. I don't know if I'd go that route...that's friction, and could easily scratch the lens.
I have no experience with them except on an old cdrom player for playing music cd's. It only worked temporarily.