I'll assume then that the dye test was checking to make sure the system was operating at normal pressure levels.

(sure you did this but make sure the red/blue wheel in the center of the dash is on blue and not red)

Here is something I read, not really your issue but may give the dealer some ideas:
Art, The condenser fan is the same as Auxiliary fan, just different terminology. I didn't understand the ambient temp statement. What is the ambient temp? I don't know where you live or what news you watch. I am also a little baffled by low pipe/high pipe references. The suction line from the evaporator to the compressor should have condensation (sweating) on it and be cold to the touch. The discharge line from the compressor to the condenser should be very hot to the touch (be careful). The liquid line from the condenser to the Expansion valve/evaporator should be warm to the touch. Your Reciever/Dryer is a canister insert on the side of you condenser (easy to replace).Remember that the X5 only takes one pound of R-134A, it is an undersized system for a big cabin area. Remember that Auxiliary fan must run when the A/C is on. Your pressures look to me like the system is overcharged but I don't know your ambient temp or relative humidity when you are taking your pressure readings. Please provide these figures. I don't believe that your module is at fault because the mechanical A/C system doesn't have the proper characteristics of a normal system. The Blend door is the mechanical wheel between the center vents. It is good that you checked this operation. The stepper motors control various distribution doors for the Climate control system and there are many. Not your area of consern at the moment. Please verify that the system has the correct amount of R-134A by evacuating and recharging the system to 1.00Lbs. Place system under vacuum for 1/2 hour and stop vacuum and make sure the system holds the vacuum. The X5 system is very sensitive to over/under charging because the capacity is so small. I would remove and replace the Drier cartridge on the condenser and inspect for metal shavings from the compressor while you have the system evacuated. If you want to replace the Expansion Valve go ahead. When did the trouble with you A/C begin? Let me know what you find and tell me left, center, and right vent temp with system running at 1500rpm after 3 minutes.

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