[Boatanchors] Fluke 8024B 750VAC range problem

[HL1FB]

I have been using Fluke 8024B for the last 30 years.

Recently I discovered 750VAC range readings are about 5% low while all other AC ranges are accurate.

Because there is only one AC voltage calibration pot in the unit, the 750VAC range cannot be adjusted independently.

I guess this is caused by a range resistor's value change due to its age or overheating.

I looked at the schematic but I couldn't pinpoint which resistor needs be replace. 

Could someone identify which resistor that needs be replaced? I have a parts unit 8024B. So I can pull

out a resistor from there and replace it.

Thanks in advance.

de HL1FB from Korea