Can u elaborate please,i want to try to fix instead of changing,..You have nothing to lose anyway since its spoilt. But be be aware there isnt much you can to do the AFM. certainly do not spray the board with any cleaners. However I doubt you can fix it as if the track is worn off you can't shift the brass arm like Bosch units.
Today i'm gonna slap back the air box on the engine,with the AFM and see what can be done,..