This line starts at the bottom of the Cockpit, just like all the problems here.
To do this problem, climb the roof right of the crack (the crack itself is off and is out of reach if you are doing the problem I'm describing).
The problem involves a big left hand reach to a good edge under the roof, then a right hand reach over the roof, then a left hell hook to get higher up. Finishes with an awkward mantle/standup over the roof.
Probably V3 as I've described it, although V2 might be a possibility as well.