On the news tonight, a flight engineer stated that he would not have flown with Tiger Airways anyway, due to the knowledge he had about their operation (from what I can gather giving viewers the indication that the issue was an engineering safety issue).
Now coming here, I see reports that are based on flight operations (LSA's) being the issue, not engineering. (I think I'll trust PPRuNe before the 6'oclock news personally), but I would be interested to know if there have been any official release as to what CASA's concerns are that have closed down an entire airline during the start of the school holidays for at least the first week.