I have been corrected. Guilt Trip climbs the roof on the NW corner of Challenge Buttress. Climb up to the chains and continue up the face to the top of the buttress.
IMHO, this should have some stars. A classic, foot-dangling roof! And yes - this is the big roof with 2 bolts right on the lip. The arete to the left is 'Broken Thumb' (aka, NE Corner)