Not everything is reliably tested a couple days after manufacturing. many people have had capacitors gone bad right after warranty, and just because the manufac

Not everything is reliably tested a couple days after manufacturing. many people have had capacitors gone bad right after warranty, and just because the manufacturer wanted to save $2-3 dollars. http://en.wikipedia.org/wiki/Capacitor_plague http://en.wikipedia.org/wiki/Capacitor_plague If your suppliers are like this, there is no telling what they will do to cut costs. A cursory test right out of production is not panacea.