The GND connections have been fixed, but would need more info to help with the second issue. I just copied what I saw in the original drawings. If you can provide more detail and another member can help to validate that it's correct, I'm happy to integrate it.I too have some corrections. These are for the Sound Interface. (I verified these against Apple's Schematics. )
UB11 pin 8 is not connected to anything but it should go to ground.
UB10 and UB11 pin 6 are also floating. These are connected to a series of components that are missing from the schematics as well. The reset/programmer's switches are not present at all.
UB10 Pin 9 is not connected to anything but it should go to the ground.
These schematics have been very helpful in my troubleshooting, but I would greatly appreciate if you could go over the Sound Interface Schematics again and make these corrections. There might be some errors that I missed, so I think this section could use a little more work. Thanks!