The Tuesday I spent 6 hours on a pitot heat wiring gremlin and found it was a chafed harness behind the left wing root | Avionics Technicians - The Design Community Hub
How long did it take you to even find that chafed spot, because I bet the actual fix was ten minutes and the hunting was the whole day right? That kind of gremlin is the worst because everything tests fine until it doesn't and you start doubting your own wiring skills. Six hours on one wire feels bad in the moment but honestly it builds character and you learn where the sneaky rub points hide on that airframe. Left wing root behind the fuel tank is a cruel spot too, tight space and you're probably bent in half the whole time. Bet you stood back and just stared at it for a minute when you finally saw the worn insulation. At least it was chafing and not some gremlin that comes back next week.