I have a Focus Izalco team 2010. The other day I was replacing the old cables from the front and rear Derailleur. This is a carbon frame with internal routing. When inserting the front Derailleur new cable, I realized It stops when it get to the bottom and don't come up. Tried several things like using a vaccum from one end to get a thread be sucked, but when doing so, the air does not flow from one hole to the other, so I think it somehow got blocked? Is is possible to fix this problem? maybe I am wrong and it is not blocked... if so, can I replace the inner routing?

Thanks for the help