Whenever, a situation like that arises, you are obligated to report an illegal activity to the regulating authority, such as the FAA, CAA, etc.. Too bad if it gets anybody in trouble. Could you live with yourself if the aircraft crashed? I was a couple of times in that situation, when a supervisor tried to cover up corrosion found during an inspection. Usually when you tell them you have no choice but to immediately report them, they buckle down and perform the necessary repairs. Your days may be numbered working for them, but, there a lot of companies out there that are not that unscrupulous.