Hi i rebuild gearbox,s for a living and have done so for over 16 years now.What nissan are telling you is rubbish the gearbox is in no way coded to the cpu.
If the light is staying on then there is a fault,ie the pressure solenoid on the valve body,micro switch on the brake or throttle pedal.
Does it drive ok?
Have nissan scanned the car to check for a fault code?
I have built and supplied these gearbox,s to lots of differant people and have never had to change the cpu.
And i have never had a problem,so i know that nissan are wrong.
If i can help in any other way feel free to e-mail me.
I,ll reply as soon as possable but im very busy at the moment so i would be replying in the evening.
Richard
rbtrans@hotmail.com
Richard
January 2008