Take both mechs off, plug FD in where the RD is, and vice versa. That would tell you if it's the cable or the mech itself that has the problem.
Yeah this. I find Di2 way way easier than mechanical groupsets but then again I find comfort in machines than humans ..
@TooTallTim started
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Take both mechs off, plug FD in where the RD is, and vice versa. That would tell you if it's the cable or the mech itself that has the problem.