Hm, congrats. I've had my TurboDuo since '93 and I can't complain. I use it very little now though, mostly for testing CD-R burns I might send out to someone. I prefer the PC. The only problem I have had though is it sometimes will skip an audio track be it music cd or game. I lubricated the pole it slides on and I think that helped a bit, but it still happens, but not biggie. =\ Changing a lens though, I'm curious what that entailed.
It was harder to do with my Duo, since I've got the S-Video, RCA and region switch mods. After opening the shell, these hold the left side of the system together and I only had a few inches of space to work with.
There's a wire keeping the right side together similarly, which pulls out from the pcb. Like the rest of these connections, It'd be pretty easy to do with needle nose plyers, but it was late at night and I was desperate so I worked with the tools I had(my big fingers).
After disconnecting that first connection, I imagine that the entire top shell would've been seperated if it weren't for the mods. So I had to lay the left side against my desk at a 90 degree angle as I worked on the rest.
The plastic armor for the lens which actual pokes through and you can see when you insert a disc just clicks off after the top casing is gone.
Now you're pretty much at the lens part. There are two connections, one red and one white, that you need to pull out of the lens itself. This was the hardest part for me, without the proper tools.
Then you turn the black plastic phillips-head columns at the right edge of those metal poles that the lens slides along. You can then lift the poles up and slide the lens off. I did this before removing the red & white connections since I needed all the leverage I could get. I should probably lubricate those myself since I got some of the greese on my fingers.
Installation is the same as removal.
The point that I labeled "pull this first" in the picture below might not be the actual place, but its somewhere around there and is the only thing connected when you first open up the system.
Its pretty simple once you've figured it out.