Sorry for not getting back to you but it looks like the other guys are getting you to a solution.
Just to clarify the internal leak thing for future readers - the behavior of the pedal will be something like it will slowly go all of the way to the floor or it may stop and get firm again if the seal finds a good spot on cyl bore.
My symptom was that the pedal would start to fade if I held it at a particular point then firm back up when it got further through the travel. It then quickly deteriorated to total loss of pressure within a couple of days where the pedal would just completely fade to the floor ( couldn't pump up the system at all like with air in the lines ) I never did get to tear that one apart to see what the problem was...just returned it for a different one.
As for the parking lever not turning the light on...I'm looking through the wiring diagram and it appears that the switch for the parking brake does not rely on the wire from the prop valve. Maybe the parking brake switch isn't touching the arm.
