what would cause eas not to lower over 50mph?

rr classic.

no faults being pulled...

does not lower over 50 (well only been up to 55,so maybe eas speedo not accurate??)
speedo buffer working fine and eas wired up to it..using yellow pink wire..

what might cause it not to lower?(disable and inhibit switchs in run position)

i am hoping its just the eas not thinking it doing 50 due to speedo inacuracy??but i dought that (speedo is -1mph out at 50,and is connected upto speedo buffer as is eas ecu)

thanks

The above 50mph has to be maintained for over 30 seconds continuously....

The only thing I can think of would be the speed sensor not sending a signal back, the inhibit switch has been pressed or the the underseat lock-out switch has been pressed....

none of the above..

had a thought on way home,will put her into raised height and see what speed she drops back to standard,this will prove if eas ecu seeing speed signal and give me a base to its accuracy (assuming it drops)
ie if it drops at 50 when it should be 35 then i know i ned to be going a feck more than 50 to drop it into highway height.if it dont drop then eas not seeing speed signal etc.
something for tomorrow...