AN were doing heavy maintenance on A320's for a Chinese carrier and sending their own A320's to Canada for heavy maintenance.
This is a long term ANZ Engineering strategy - charge top rate to do third party work, then ship their own aircraft off to a cheaper Maintenance Provider.
As an aside, the Sichuan contract was very lucrative and feedback from the Chinese was that they were very impressd with the work done at AN to the extent that they had booked the rest of their A320 fleet in for checks prior to the collapse and even contemplated sending them to the Engineering company post TESNA but the spectre of being in administration was ultimately too much of a risk.