If maintenance is required, you only need to replace the part that has pulled away. Another project for this month is to improve the airflow between the outside and the attic. May is the month we clean Bedlam's soffit vent screens. It's easy to do with either compressed air or a vacuum cleaner. With a little ingenuity, either can be used from outside while standing comfortably and safely on the ground.
Ultraviolet light causes wood to gray and become brittle.
Several products restore the wood's color, but if you want to get rid of damaged wood, sanding is the answer. You can use a floor sander on a deck. Once done, protect the wood with a sealer that blocks ultraviolet light. This is also a good time to treat the yard, block, neighborhood, city and county for the red imported fire ant. If you treat your yard, they move to your neighbors.