Transom, transom, transom. You can take a rubber mallet and hit it all you want but really does no good. Look at it from the inside, outside underneath, and over top. I have went with a couple different people to look at boats because they're newbies at boating. 1st boat was easy, seller says its all good, I ask to trim 90hp Outboard up so I can take it loose from transom saver, seller says "oh, battery dead, sorry can't do it". I brought my own battery
, get motor up and off transom saver, transom was so bad I thought the motor was going to fall off, grabbed lower unit and you could lift the motor up and down easily, so with permission from seller I undid the outside livewell nut and pushed in livewell tube, stuck my finger up and into the rotten wood of transom freely with water pouring out the transom wood. My friend had all but given this guy the money before I looked at it. Boat was worthless. Seller was pissed as hell that I told my friend not to buy it, seller said some stupid crap, and I called him a crook because he knew the transom was shot, but wasn't going to tell my friend nothing.
2nd boat, different friend, just about the same problem, and the floor under the carpet was about to cave in. Oh the seller had it all looking good, but his batteries were dead also, Hummmm.