Turbo5B, I have spent the last 33 years of my aviation career in flight ops, the last nine years of that on freighters. As an ex LAME, I am fairly familiar with the dark corners of the fuselage and have made good use of that knowledge when accepting aircraft for a test flight after heavy maintenance. In fact, when my company purchased a Tristar L1011 from a prominent operator in Miami that was overhauled by their maintenace organization, my inspection of the "dark corners" of the airframe, delayed our delivery flight by one week.