Surely it would not have to be manufactured from scratch. Wouldn't this take too long? One source suggests they take 20 days to manufacture, which may be exclusive of testing.
From where would it have to come? Prince George, Virginia USA? By what means would it get to LAX: a cargo airline such as FedEx or Cargolux?
https://www.rolls-royce.com/country...-royce-in-the-us/rolls-royce-crosspointe.aspx
VRR solves problem of transporting Rolls-Royce aero engine | VRR
QF A388 VH-OQG is still sitting in LAX according to various flight websites.
Monday 22 May's QF16 (B744 VH-OEF) departed LAX 44 minutes late at 0004 hours on Tuesday 23 May; Wednesday 24 May BNE arrival will be at 0655, 45 minutes behind schedule.
Also on Monday 22, QF11 became a B744 (VH-OEF) while today (Tuesday 23 May) it was VH-OJT, probably the first time for a long while that it has been a B744 and not an A388 on two consecutive days, which is probably due to VH-OQG languishing in LAX. This downgauging as airlines call it may be harder on a typical Thursday to Monday as from memory not just the A388s but the QF B744s are often fully committed on those days, although sometimes there is an allowance for one of each being inoperable due to planned maintenance.
While there is no public information as to whether QF11 (and QF12) have been heavily booked - but QF12 may still be carrying overflow passengers from the VH-OQG incident of four days ago - advice from anyone who was 'bumped' due to the substution of a smaller seating capacity B744 for an A388 would be great as to what alternative flight arrangements were made, hotels, meals, transfers and so on.