I briefly considered taking one of the cards along to my high-reliability soldering class just to provoke a reaction from the instructor.. But figured it might

I briefly considered taking one of the cards along to my high-reliability soldering class just to provoke a reaction from the instructor.. But figured it might bring down attention from On High into the state of our circuit cards and that wouldn't have been good. Besides, they lasted 5+ years like that before needing replacement. We pretty much only replaced them when the boards became brittle from the heat.