Yes, I have challenged a JC surveyor and won. In OB, we keep small quantities of sterile processed instruments on the unit (kits, individual peel packs of stuff, etc). The surveyor insisted that we needed to monitor temp and humidity in the room and keep a temp log. I insisted that we do not, because this clean utility is not "centralized sterile processing" but rather, an ancillary area to keep small quantities of instruments. I then showed her the document FROM HER AGENCY'S WEBSITE that states what I just told her, that ancillary areas (and the document even cited "OB department clean utility areas" as an example) did not have the same requirements to monitor temp and humidity. She then questioned the document's wording of "small quantities" and that is a subjective term and one could state that we had more than "small quantities" of sterile instruments in our clean utility area. I then stated that the document intentionally left it vague and up for interpretation of the individual facility as to how they want to define "small quantities" and our facility has determined that the amount we keep in our clean utility room meet's our definition of "small quantities" as evidenced by the policy we have on the topic (which I then produced for her to read).
It's been my experience that JC surveyors are human, and are subject to their own whims and biases when it comes to interpreting the agency's regulations.