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Thanks - that sort of thing was my guess. Will maybe dismantle for the fun of it.
Annoying as can only justify replacing it with ultegra which doesn't look nearly as nice.There's a guy in the UK that repairs front derailleurs and rear derailleurs. He can probably tell you whether or not it can be fixed.
His name is Pawel Niewiadomy (https://www.instagram.com/paweln83). I've had more luck contacting him on facebook though. He also posts in the 'Shimano Di2 Forum' group on facebook (not my group, but I am a moderator): https://www.facebook.com/groups/shimanodi2
Thanks - that sort of thing was my guess. Will maybe dismantle for the fun of it.
Annoying as can only justify replacing it with ultegra which doesn't look nearly as nice.