If it hasn't been flying every day, that doesn't necessarily mean that it's "grounded".
Well, when it has been on the ground for two weeks whitout even turning the transponder on, how do you call that ?
When you perform ground tests, there's a minimum systems you have to turn on, depending on the test performed.
The two first days after aircraft arrival in Al Ain, there were signs of activity. They were moving the aircraft on the tarmac, then no signal at all for 2 weeks.
The previous hot weather campaign last three days ! Same thing with the other engine.