Update
Well, the news was good. After driving the car around for a month with the A/C running, the dealer found dye around the expansion valve. There was no dye in the condensate from the evaporator. So, if I'm lucky, I just need to replace the expansion valve and recharge the system. While I'm doing that I will also replace the receiver / dryer because its easily accessible and inexpensive.
BTW: I used BG's Frigi Fresh on the system today and it seemed to work as advertised. The bacteria / mold smell is gone. I'm keeping my fingers crossed it stays that way.
Thanks to one an all for the advice
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