To lube the cam spindle washers, get a cocktail stick and place a bit of lube into the hole, as you push the spindle through and rotate it, the lube will get to the washers, without taking it apart.
it’s a good idea to lube the O ring on the Mushroom (bit with the red X) , other than that the mushroom shouldn’t need to be removed again for years.
Did lubrication actually fix the other problem….you omitted to mention that?
P.S. You can also lubricate the sides of any valves, where they move up and down in group…e.g. like the one in the last photo.