Hello,
I also have a 4332A and the manual, too. I looked at the A4 schematic and found that R35 on A4 is a 9.09K resistor, not 100 ohms. I don't see how a 9.09K resistor could burn, you'd need something like 60V or more to burn it. There's no high-voltage source in the 4332A so I don't understand how R35 could overheat.
I would first suggest disconnecting the four input signal leads to A4: the HIGH and LOW leads, and the orange wire and the white-red-green wire. Then you can test the various voltages which are shown on the A4 schematic to look for a failed part.
And please let me know, I'm happy to help. The 4332A is quite a neat instrument !
Joel Setton
