How do I fix CB750's malfunctioning neutral light?

Q. The neutral light is on the blink on my 1996 Honda CB750 F2, which means I have to pull the clutch in to start.

Where is the switch? I want to get this fixed.
John Watson, e-mail
A. There are two possible causes here. Either the clutch diode, which is plugged into the wiring loom near the battery and fuse box.

Or the switch for the neutral light which is on the left hand side of the bike between a blanked off filler cap and the gearbox sprocket.