Oh ya I played this, on my copy of map i got from map pack passage is blocked, dunno if this is any different. Is this doable on your end husky?
The area blocked for me is squiggly area right after you walk on roof, middle map. At the end of passage I can't get through, might work with shotgun but haven't tried that, and would void chally anyways. Also bottom left steep ramp I haven't been able to get up, might be impossible but havent tried all avenues yet.
LMK