The actual discovery of the wiring problem is pretty interesting. It starts on page 17 of the Engineering Factual Report[1], which is one of many released[2].

The actual discovery of the wiring problem is pretty interesting. It starts on page 17 of the Engineering Factual Report[1], which is one of many released[2]. The wire in question was carrying unknown current (likely 20-50 mA), but 110 volts DC signaling. Comparing the photos on page 22 (Dali) and 25 (Cezanne), you can clearly see the blue ferrules in the correctly wired panel on the Cezanne. [1] https://data.ntsb.gov/Docket/Document/docBLOB?ID=19228257&FileExtension=pdf&FileName=DALI%20-%20DCA24MM031%20-%20Engineering%20-%20Factual%20Report%20-%20FINAL-Rel.pdf https://data.ntsb.gov/Docket/Document/docBLOB?ID=19228257&Fi... [2] https://data.ntsb.gov/Docket/?NTSBNumber=DCA24MM031 https://data.ntsb.gov/Docket/?NTSBNumber=DCA24MM031