@rab38103 From my days in strengths of materials class while studying engineering, that is known as a Fatigue Fracture and is way worse than a crack as the support integrity of that beam has been compromised. They were wise to shut it down quickly!
I like to name the MS Word doc I'm working on "The World". That way every 10 minutes, I'm saving The World. It makes these project feel like much bigger accomplishments. #SaveTheWorld