So, I am pretty sure the optical drive on my MBP is failing as I am having trouble installing software like windows, office for mac, and just burning stuff. So, I did a search here and look it up at ifix it, but I am not sure what is the right model I should be looking at. I have the first gen MBP with the Core Duo CPU. iFix it lists two models UJ-857-C and UJ-867. So, will both work or is one of them only going to work? I know my original optical drive could not burn DL dvds, but it seems like both of these can though? Ideas? Thank you.