Interesting, thanks. I hadn't thought about sucking up stuff other than solder, and the occasional resistor lead which then instantly turns into tungsten carbide inside the heater core... 
What kind of boards are these? And why do dozens of chips fail on the same board?
Haha, agree with your comments about resistor leads inside the heater core. But I can do better than that, broken HSS drill bit inside the heater core.
Had a xxl-long 3mm drill to clear the heater hole until some butthead coworker broke it inside the heater..
Boards were vintage industrial controls. There was not necessarily dozen of failed chips but in many cases it was faster and cheaper to replace them all at once than spend half a day wondering where the fault is. Or if the fault was internmitted (once per week..) or temperature related.
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