It's happened before!
Mention of the 757 makes it opportune to note Boeing's difficulties with the introduction of aramid (KEVLAR) reinforced plastics on the 757/767. Aramid composites were chosen (in preference to carbon) on lightly loaded structure like trailing edge panels. Worked fine during certification but in real life temperature cycles caused aramid components to crack and absorb moisture within 4000 flight hours. All had to be sealed then replaced. A hugely expensive mistake. Service Bulletin 767-51-0008, April 1985 refers.