Fender Super Bassman 300

Hi folks,
I will have a Super Bassman 300 on my bench within a few weeks. It gives me the time to search for a schematic.
So my question is asked: Anybody with a schematic of this amp?
The problem as far as I've been told is that the auto bias circuit is disabled or even removed. It also need a thorough check-up and a back to factory settings.

Here a picture of the amp.
The Super Bassman CFA7002 is not the one. It has 4 inputs while this amp has only two.
No Deep or Bright switch, only a Vintage/Overdrive.

Thanks for reading and possibly a schematic.
Cheers,

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