Anyway, back to on topic...
It’s no surprise that an ageing fleet is going to cause serviceability problems. A short-term solution could be to remove a number of the oldest, least economically viable airframes form the Fleet. This would have the advantage of increasing the pool of spares and releasing engineers to work on the remaining aircraft. A, say, 10% reduction in numbers would probably have very little impact on the number of aircraft available at front line....indeed there would likely be a short-term (1-3 year) improvement in serviceability, which might see the Fleet through to the arrival of the new aircraft.