From WXYZ.com:
NEW ORLEANS (AP) – The cause of a 34-minute blackout at the Super Bowl remains under investigation, but public records released Monday show that Superdome officials were worried about a power outage several months before the big game.
An Oct. 15 memo released by the Louisiana Stadium & Exposition District, which oversees the Superdome, says tests on the dome's electrical feeders showed they had "some decay and a chance of failure."