The Menlo Park specifics
Mature trees over decks are common here, and shade changes the failure profile: shaded boards rot at joints and fasteners rather than UV-splintering on top. If your deck lives under oaks, expect the damage where boards meet, not where they weather.
Next step
Worst boards straight down, deck from a corner, one shot underneath if reachable — through the form for a count-based range.
Materials and matching: see the service page. City rules: see the Menlo Park page.