Don’t know where you are located but there is a 2006 232 at Comstock in Brick NJ. Twin 150’s @ 750 hours. Comstock is a GW dealer and the listed price is $49k, who knows what the actual sales price will be. Looks in nice condition and well outfitted as a comp to the rig you are considering.
Good luck with your survey. If the rest of the boat is really clean that’s a sign that the mechanicals were more likely looked after. Just like a car I would not buy a boat without an inspection and service records. If factory authorized service was done there should be documentation. If owner self-serviced, can he provide records for purchasing oil, lube, fuel filters, spark plugs, water pump, etc. Pull the engine cover, spotless under the hood? No corrosion on battery cables? All the hoses have good integrity? No slapstick wiring jobs? There are lots of little clues all over the place.