Well, problem(s) solved.
Not only was the shroud screw put through the reservoir on the one jack I started to inspect but my mouth dropped to the floor today when the technician came to us in the waiting room and said that all four jacks had the same issue. The person who initially installed them put the screws in a bad location. There were a few other abnormalities in the installation.
They couldn't figure out how the system operated for 9 years in this condition.
Obviously not a good installation job. I don't know where they were installed. Before today I thought they had been installed at the home-office factory. I know they were installed when the rig was new....before we owned it.
Anyway, the factory fixed us up. Said it was as good as new.
They are great people. Nice to have them close to home.