Tuning Gulbransen Theatrum organ pedal

[Foster]

My organ has the C# pedal of tune. My service manual has the pages covering the pedal circuits missing.
I have no idea where the adjustment can be made. The description of the organ states that the pedal circuit is independent of the manual circuits.
As it is a divider system, perhaps a divider on the pedal board is faulty.
Foster

[tucsondave]

There is no individual pedal note tuning. It's possible that the transistor associated with the C# is not saturating when keyed and introducing a resistance to the voltage divider. If this is the case, the C# would be playing sharp.
The only tuning is to insure low C and Hi C are in tune.
Walking bass is separately tuned.
td