Clear the valley first
Debris can hold water back and hide damage in the lining.
Look along the full length
Water seen low down may have entered near the top of the valley or where it meets another roof detail.
Repair the lining that is actually there
Lead, tiled valleys and preformed channels are put together differently and need different repairs.
Want the problem checked properly?
If you have a photograph from safe ground, include one that shows the whole area rather than only a close-up.
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