Thanks guys, just emailed Dean.
This 200 is serial 303. The person who does the annual has been adding/replacing oil to the system but the owner says it doesn’t help. The last time he put in thicker oil and that didn’t last either.
I’m guessing there is a seal or Oring in the master actuator that is bypassing the pressure.
I have not opened it up to see what it looks like. Still winter here in the North Woods.