First of all you should try to calibrate your Expression Pedals. Already during calibration I noticed, that my Expression Pedals barely changed or did not change the values at all for about 40% of the way. So then I tried a suggestion by orb451 and checked the sensor and the corresponding LED. To do that you need to follow these simple steps. Notice: I do not take any responsibility for any damage at all.
1. We need to open up our Board by unscrewing these 16 screws. Notice that some are longer than others, just keep that