Hit 500 days of straight zero-finding squawks on my pre-flight walkarounds, starting to think I'm missing something | Aircraft Mechanics - Opinions Matter
What exactly are you checking on those walkarounds, or are you just doing the same loop every time without really looking? 500 days with nothing found usually means your eyes are skipping over stuff out of habit, not that the plane is perfect. Try picking one system per day and really digging into it instead of the same quick pass.