Richard Hogan

I have recently obtained a 494/AP unit and copies of the service manuals.
However, the Log Amp board shown in my service manual vol 2 is not the same as the one fitted to my unit.
Can anyone please help identify the board version and advise where I can find the correct layout/parts list/circuit diagram for this board?
I have attached a photo for reference.
This issue has been raised by John Miles in his very useful service notes for 49x etc series of analyzers but no advice was given on where to find the technical information for this board.
Any help with this issue will be greatly appreciated.

Thanks in advance for any help,

Richard,
Thailand