Overall I think the gear's and belt are fine, lots of grease still, and the belt even has teeth.
Since I took it all apart and the CD drive motor is not connected, it's been doing something it never did before, like start/stop/reverse/stop then motor above, for a few mili-sec, . The door never used to start then stop , but all the wires for this motor and sensors are hooked up....so I'm guessing its the lack of the CD/laser ribbon cable that's doing that.
Looking at it's SW, there's not usually much bouncing, if u press it 1 way, but pressing it on the edge, can cause 2-3 full bonces. It has a 1nF cap on each button of the R-ladder, which has a few other buttons for, that the MCU-ADC looks at.
But sometimes, the door would be stuck open, and you could press the button repeatedly, and the SW was working....but nothing would happen. I never really measured the motor, the control signals yet, when that was happening, since it's intermittent.
And now that I've taken it apart, I never had the CD/laser part hooked up, when I was probing it.
But for probing a motor, unless my probes are failing (which some of them are mechanically sensitive/failing) I'm assuming the motor must be shorting or the driver IC is failing, for it to look like a noisy mess, and other times, look like a really nice sqr-wave