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Meh, it's not mine and it's fucked, so it's an SEP. I've told @Cycliste she either needs a new 6770 rear mech, or 6870 front and rear mechs.
Mind you, this bike also needs a new rear rim and needs to have the frame repairing, so it's not exactly urgent...
I wonder if its skipped a few teeth inside the motor or something. Give it a shove whilst shifting? :P Perhaps it might be a good candidate for dissasembly :)
https://www.youtube.com/watch?v=DsPko9ih0JE