Errors

If this is a Xerox 128, I have looked through all the documentation and those are non standard fault codes.
I would first start by seeing if the scanner was comming on and moving correctly.
The only other thing you can try is to remove all the covers and disconnect and reconnect plugs, and ribbon cables.
There is nothing in the documentation or engineering notes to reference any of those error codes.
Not even eliminating the P and just looking up the individual codes as just numerical codes.
A non functioning scanner will produce many odd codes not listed in documentation, which is why I am having you start there. Reseating connectors will allow all modules to communicate, which can also produce odd codes.