Are you the original owner? Do you KNOW how she's been Stored and maintained. Soft spots in the deck, usually but...Not Always, indicted issues below the deck too. IF She's been stored outside, uncovered for some time, then water will accumulate and could cause the deck to rot only in isolated spots. If she's been exposed to the elements a lot and water has gotten below the deck then you could be facing a total restoration. More investigation is warranted.