It would not surprise me if upon inspection you find that cylinder that is 10 psi below the others has some scoring or something funny going on, however
Thanks, I saw that before. I think my issue might be mentioned in this article.
it is used in freshwater only, and has been several years since last replacement.
The driveshaft should come down and out with the lower unit !------Is this a salt water motor ?-------When was lower unit off last for a new impeller?
The driveshaft should come down with the lower unit !