I am feeling a little stupid about this.
I checked the vacuum servos individually when I got them out of the car, and only one was completely dead, although it is the one in the heater box.

But I did find the major vacuum leak; the rubber connector to the yellow check valve behind the brake bomb was completely cracked. What does this check valve do? How do I test it? If it is supposed to keep a vacuum leak from getting back to the engine, it may be faulty.

Also disturbing is the lack of oil in the AC system. I turned up the evaporator and no oil came out. Hopefully when I reseal the compressor it will have oil. Otherwise should I put in a full oil charge, or count on some being in the condenser?

And here is the obligitory photo of the event. I call it "some assembly required"

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