Leaks, damaged roofing and changes visible from the ground are reasons to arrange an assessment. A warning sign alone does not establish that the entire roof needs replacement. Ask for photos, an explanation of the cause, and a comparison of repair and replacement where both are practical.
The written proposal should identify the roofing product, work included, treatment of concealed damage and separate material and workmanship terms. Confirm the property address and scheduling before planning around a start date.