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First, determine where the problem areas are. Use an air gun to look for any gaps or loose metal flashing.
Next, loosen the gutter nails to further expose the problem areas. With the gutters loosened, add a bead of caulk in any existing gaps. Apply between the upper and lower flashings to ensure an air tight seal.
Install hidden hanger fasteners to further secure the gutters. Then use the hidden hanger fasteners to secure the gutters. Position the gutter fasteners several inches apart and nail in place.
Apply caulk to any remaining loose flashing around the roof area. Allow the caulk to dry and test your work with the air gun.