This involves printing it and the original, then marking checked tracks with a highlighter pen. Not difficult but you do have to be patient and meticulous. I can do this.

2024-02-05

I printed the old and new schematics on A3 paper. 

First job will be to check the pin numbers of each part match.

2024-02-16

Checked final sheet today. All sheets now checked.

No discrepancies, although the original numbers header pins in an unconventional way.

The capacitor for BBG looked wrong (+ve to ground) until noting that it is the decoupler for a negative bias generator.

Original circuit omits power and ground pins, so I have not been able to correlate them.