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Does the RD actually move? If the red light is on the Junction Box A it could be in fine-adjustment mode. Assuming you've already held that down for 10s or whatever then it's unlikely but possible. If the derailler is making a noise when you push the shifter button, it's not the shifter button failing it's likely trying to move but can't so either something (like my B-screw setup) is preventing it from moving or the unit is fuxxored in some other way internally, but that seems unlikely given not crashy crashy (I assume, not been following conversation).
hippy
@atz
It'll shift the front ring no problem. The servo makes noise, almost like it's micro adjusting when press the shifters so the connection is there. When I pop back in an hour or so I'll suggest removing and reinstalling the mech. - @hippy