I agree with George. buy a working new or used Sanyo mechanism and replace it. It is not difficult at all to replace the drive mechanism, and that definitely appears to be the problem.
I don't understand the logic of buying a new unit when you are happy with your existing unit. It is a computer drive. When the drive fails, replace the drive.
Especially if you are happy with the sound of this unit.
Why spend extra money if you don't have to.
I bought a used Naim Unitserve music server recently. The drive mechanism read one disc and didn't read others. It also ejected disc about two feet. Funny.
The existing drive was a Teac DW-224SS-W93 drive built in 4/2010.
I contacted Teac and they told me the replacement drive is a DV-W28SS-VM3. So I bought one and replaced the old unit.
I also opened the old unit and cleaned the lens and lubed the moving parts and it worked much better. Its not rocket science.
The unit works great now.
enjoy