Posted here as this might be a job for a roofer framer. Need some advice. one year ago I worked on a roof leak. Main roof is a 12/12 that comes down half way on one side and forms a wall. Looks like the side of a dormer window. Roof that connects into that is a hip roof. The roof was leaking right on the corner of the wall. The framers did not bring the valley to the corner but stopped 5 inches up so all the water runs straight into the wall. We removed all siding from that wall and removed the shingles. Covered the wall with fire and ice, extending that out over the roof, and re did flashing, built a solid piece of flashing (copper) to turn the corner of the wall. No more leaks until the gutter man installed a gutter and nailed what he called a rain diverted (piece of metal he made

on the roof to move the water from the valley to the corner. Seems like he might have compromised the flashing, as this spot is leaking again. Owner would like to re do that valley and this is not something I would be able to do. Another contractor suggested a cricket, another sleepers??? I don't know enough to help them decide what to do and hope you experts could give advice.
Can a valley be moved to right place, or water be diverted by rebuilding that part of the roof? May be I can get pictures.
Thanks for any tips or advice you may give.