@kentindell @nuthatch @danluu Yup. I've rejected an aircraft more than once.

Once, for example, because I spotted a tiny dent in the tailplane that nobody else had seen. Presumably it had been bashed by something in the hangar. Had this been a hard enough bash to break or weaken something structural inside? - I didn't wish to find out, that's what engineers are for, not customers. The next time I rented that aircraft the dent was no longer there.