toofast68, I have replaced the laser assembly in my PS3. You will have to disassemble your PS3 and get eyes on the assembly to see what part number you will need. It seems that if you get the whole drive assembly it will cost more, but if you don't know if you need the drive or the laser, that may be the best way to go.
Mine would not play dvds or BR and I believe I just replaced the laser. It's an easy replace. If you can get the PS3 apart, you can replace the laser. Just have to be careful with the ribbon connection. Replaced mine over a year ago, and is still going strong.
PM me if interested in where I purchased my part. My understanding though, is that you have to get eyes on the part number to make sure you get the right one. Dis-assembly is difficult at first, but if you do it once, it is alot faster the second, third time.