Originally Posted by
HillRider
You may have to pull the crank and remove the bottom bracket to see inside the bb shell to diagnose where the cable is supposed to go.
+1
You can always replace internal cables one way or the other. This is obvious since the factory started from scratch and attached the wire and believe me they didn't fool around with a vacuum or anything.
The key is that factories thread internals cables before installing the BB, which gives access to where the hard bends are. Cables are usually guided by means of a stiff wire "fish" which is pushed down from the end and used to pull the wire through chainstay, or whatever exit path is involved.