WASHINGTON/DETROIT (Reuters) – U.S. regulators on Friday slapped Takata Corp with a $14,000 per-day fine for failing to fully cooperate with a probe of its faulty air bags and revealed that a fraction of the 17 million cars recalled because of the problems have been repaired. The Japanese parts supplier is still struggling to come to terms with the massive recall and investigation related to the air bags, which have been prone to rupture unexpectedly, spraying shrapnel into vehicle occupants. Takata failed to comply with two orders U.S.