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that is quite strange .. but not unfathomable
maybe as a last ditch attempt try e-tube-ing it yourself and see? Maybe a firmware update or a reset might do the trick? Worth trying a diff batt too. When you say drain, how quickly is it draining?
105 Di2 is a lost cause IMO. Unavailable, 12 speed and expensive.
amey
Netakure
News of 105 going Di2 and disc only comes at a time when I am at the end of my tether with both.
First the piston seal in my shifter failed out of warranty and now the bike shop tells me there’s a component draining the battery but E-tube doesn’t specify which component.
Is there a way of sorting this without plugging a different FD and RD in sequentially? I don’t suppose it will be a shifter problem and seems unlikely a cable could drain the battery.