Ex Seaking Mech here. I made this prune account because I am interested in finding out where it was.
I dread to think it was either the drip tray, sound panel bags, tail thermal barrier or honeycomb walkway as these were always ripped and/or smashed to bits but since they are not concerned with flying crew I doubt it was. If it was these loads of people would be coming down with the illness. I'd also be a bit worried if anyone said it was inside the engine door lining as yet again this was getting ripped apart when the door latched jammed and loads of people exposed. If it was brakes or another specific component then exposure is gonna be pretty limited to dudes ripping em out. Cabin heating and bleed air gaskets would be pretty bad too.