That's fantastic. It's really satisfying to get to the cause.
The arrangement for holding the hall sensor legs and wires is not that good. I guess that vibration caused metal fatigue in the legs or wires, which is what caused the detatchment. You might want to think about holding them down with silicone or something like that to dampen or prevent any vibration after repair. Also, I think I'd replace all three because one of the others might be cracked but still attached.
The arrangement for holding the hall sensor legs and wires is not that good. I guess that vibration caused metal fatigue in the legs or wires, which is what caused the detatchment. You might want to think about holding them down with silicone or something like that to dampen or prevent any vibration after repair. Also, I think I'd replace all three because one of the others might be cracked but still attached.