2022年8月，机队发生一起当灯光电门在DIM位时驾驶舱FDR OFF灯在测试完成后依旧保持熄灭，未重新亮起，依次隔离FDR控制面板、FDR、DFDAU均故障依旧，后续参考SSM和WDM量线隔离为FDR控制面板连接插头D483的pin 7（28V DC供电）与pin 19（灯光明暗28/16VDC）两个销钉位置装反，将销钉位置调整到与手册构型一致后测试正常。
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日期: 2022 年 8 月 11 日
门警告的MILS值测试
SR 3-5390070991
前登机门S199 88mils（标准80-120mils）→278mils→TGT FAR
后登机门S200 87mils（标准80-120mils）→276mils→TGT FAR
前勤务门S194 148mils（标准90-180mils）→295mils→TGT FAR
后勤务门S195 97mils（标准80-120mils）→249mils→TGT FAR
波音认为NEAR不会导致门警告灯亮。
Target NEAR indication will not trigger the passenger entry door light to illuminate. However, per FIM 52-10 Task 801, any anomalies with the Aft Entry Door sensor itself, the Forward Entry Door Switch (S1147), the Entry or Galley Interior Door handle being out of position, the Service Door out of adjustment, the Wiring, and the PSEU itself, will result in a door indication.
而设置最小的MILS值目的是防止在出现震动等条件下时，避免发生干涉。
