Ran across this pic which is about 4 years old.
The customer called and said the a/c would quit cooling soon after it was worked on.
The house was new, inspected by the city, and they had the original company out three times for the same problem.
I saw the problem when I stuck my head in the attic.
Aux pan switch was turning the system off, and I guess the company would clean the pan out on every trip. Hard to imagine... I just don't have words for this.