TOKYO, March 29 (Reuters) - DaimlerChrysler AG's scandal-hit Japanese truck unit apologised on Tuesday for late defect reports including for vehicles that had been repaired once, showing the firm has yet to put quality issues behind it. The apology came after Japanese media reported at the weekend that the Transport Ministry would question Mitsubishi Fuso Truck and Bus Corp. over several new defect cases involving fires in its vehicles, none of which involved fatalities.