Of all the Cervelos I've worked on (Dual, P2SL, P2, P3 and P4), the P2 seems to have the smallest cable exit holes on the downtube.
You may get lucky and the cables pop out after the first try.
If not... It could take a while. My advice is to fashion a hook out of a strong paperclip and use that to help fish out the cable at the downtube exit. You may need a flashlight and a third hand to get this done!
You may get lucky and the cables pop out after the first try.
If not... It could take a while. My advice is to fashion a hook out of a strong paperclip and use that to help fish out the cable at the downtube exit. You may need a flashlight and a third hand to get this done!