steering channel issues on sanwa super exces

[Martin.s]

So I have a core Rc 5008 servo in both my LMP and GT12. I have a sanwa super excess transmitter that has been converted to use the frsky 2.4ghz hack system.

The issue I have is as follows:

The steering channel servo in my GT12 has much more linear control when moving right than left. The servo responds throughout the full range of the stick when it is moved right and yet when moved left the entire movement of the servo is in the first 30% or so of the stick, in effect leaving a large dead band and the extreme movement of the stick to the left.

I've tried resetting all trims, sub trims, expo etc etc and even erased the settings in the model memory hoping that would fix the problem...but no.

There seems to be much more movement of the servo to the right than left and it seems as though the seeco thinks it is centered when the stick is centre but in reality the servo is centered with a left hand bias.

In short...is there anyway of removing this 'memory' of left bias from.the servo and starting again? Thanks!
Martin