I have been asked "can you get the airplane back?" and other similar variations, but that was partially because there were some kool aid drinking pilots who absolutely would do whatever they could, legal or not, to get the job done. I've answered "no" without getting a lecture, but I did witness a guy getting lectured because of how many things he was getting fixed at out-stations. In that instance, the guy doing the lecturing was a former kool aid drinking golden boy who became part of management, but I don't necessarily believe that his boss would've given the same lecture.
This is the cockpit version of office politics, with the pilots being the ones carrying most of the legal and all of the mortal burden. This is why I feel naked without union protection, and it's partially because there will always be a pilot who never says "no."