Wiring CAN Fail
JD, no wiring installation is perfect. A minor imperfection hidden for years, when subjected to normal airframe vibrations, could break down without warning. We used to use soldered connections but manufacturers prefer crimped connections because they are cheaper to implement. Crimped connections are not sealed by solder and are subject to dissimilar-metal corrosion. In the Navy, we found this to be a serious problem because we operated in a salt-air environment. Connections can, and do, break down. I am not saying that this happened here or that there was any wiring fault at all. All I'm saying is that it could.