The EAS parking lot is full of old airframes, some are there since more than 10 years. The engines were removed because they were valuable at some point, the rest is just canibalism for spares .
The 72's were at one point owned by them , as they ran an airline in the 80's.
Do not draw any conclusions regarding engines being removed (or not) for normal Checks or paint jobs done by them. 2 different things.