CX delay

[RodH]

CX 170 scheduled out of Perth at 2355 on the 14 June is delayed 15 hrs.
That seems to be a very long delay. What would cause such a huge delay?

[Basil]

Crew out of hours?

[PAXboy]

Serious tech fault with no spares having to be flown in?

[Amadis of Gaul]

A case of SBL.