Hi peeps

Hit the drags locally (Perth, AUS) last Wednesday and as i was going down the pass the E-Brake light came on - looks like this (!).
I was in fourth gear at the time doing about 140kph (90ish MPH)
I checked the handbrake by pushing on it.

After the pass i parked up and turned off the car turned the key back on - light was still there
I pushed the handbrake down - light stayed on
I checked if the roof engaged with the handbrake down - it didnt and light stayed on
Also disconnected the Convertible Roof control unit
so its not the handbrake.

I then unplugged the the Mastercylinder float switch - light stayed on
Fluid was not low either and float seemed to be floating as usual.




From the diagram i gather thats all there is to it, with all ends open the light should not ground.
If its shorting where would it be is it common?

I think it cant be shorting on the handbrake side of the circuit otherwise the soft top would be functional even with handbrake down.
only other thing i can think of is a short on the float switch side.

Anyone got any ideas to diagnose?