If the hydraulic quantity was showing as low it begs the question why?
A leak perhaps?
The leak may have been somewhere quite difficult to access or on a componant that was not available locally, such as a hydraulic filter module. It could have just been an o ring or gasket that failed, but again if it was not stocked locally a delay of several hours while the part is sourced is not uncommon.
If it was low enough to cause the pump to cavitate it may have been necessary to change the pump also.
the airbus hydraulic system reservoirs can be replenished in just a few minutes, assuming you have an engineer with an adjustable spanner, can opener and a few cans of hydraulic oil!
Adjustable spanner? On aeroplanes?
