I don't know about parking the aircraft but I was talking to someone from the sim the other day and my understanding is that it was shut down to do maintenance and a fidelity.
The sim requires quite a bit of time and money spent on it, however, it was decided that it wasn't worth spending the money until the future of the B727 operations was determined and they could be sure of recovering the investment.
The term he used was it was a waste sending good money after bad without knowing where the future was going. I think they are one of the largest creditors of Aeromarine.