While each box is open turn the power back on and carefully use electrician's pliers to wiggle all the cables entering the box. You're trying to provoke the short circuit. When they start tripping, overheating, or making strange noises, it's more than just an inconvenience - it's your home's cry for help. In this guide, we'll walk through these. An electrical explosion is a sudden release of energy caused by a fault, arc flash, or short circuit. Sparks and explosion definitely should not happen in a breaker tho. Idk why you'd think that LEDs are not sparks, there's nothing ionized there, nothing thermally hot.
[PDF Version]