I'm looking into a 1984 proline center console with a 1991 90hp yamaha on it. Looks clean in the pictures. Guy says has a small soft spot on the floor near the console. Other than that, supposedly mostly fresh water use and low hours on the motor. He is the third owner. He's asking $3500 firm. I'm a little concerned about the soft spot. Any common issues or problems with the boat or motor that I need to know about?