Don't blame HAECO for an aircraft that is not fixed having been on the ground for hours, they have a contract to accept the aircraft, report defects and to depart/rectify aircraft defects, it's CX that decides to book and pay for extra time to repair a defect outside the allotted contact, CX policy is to hope the defect can be repaired in the "contracted" and already paid for time.
And we all know how much CX likes to step over a pound to pick up a penny.