Well, I should have quit while I was ahead. About an hour after buttoning up the engine compartment, I decided to pull the evaporator drain hose out of where it sits and the floor pan.
The BAD NEWS: There was dye inside the tube so this confirms that the evaporator is leaking refrigerant.
The GOOD NEWS: A Porsche local shop with replace the just evaporator with an OEM replacement for about $1500 out the door. That's $300 less than what Porsche charges for the heater box part alone which includes evaporator. Porsche tells me they wont sell the evaporator separately.
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