I've got a line on a 1987 20 Fisherman, under the serial number it is stamped F-20, is this boat hull a V-20?

What are some things to look for on this boat?

It is pretty clean, 2004 175 Yamaha Salt Water Series.

How can I check the transom without drilling holes?

I pulled the starboard rear screw hatch, fuel tank? The foam is soaked.

The entire underneath looks great almost new.

Any help is appreciated, thanks.

Jeff