The investigation of the QF A330 looked at the possible effect of the Learmonth facility and found there was no link.
FWIW… This finding always interested me as prior to both the Malaysian and QF72 incidents, we had a momentary total electrical failure in a 767 passing Onslow (100km from Exmouth/NW Cape). The screens went blank for 4 or 5 seconds and the Status page indicated the HMGs had been commanded to operate.
There was no physical change to the flight path. We were enroute PER-DPS and upon arrival in DPS the engineers ran a series of checks that confirmed we had an electrical failure that lasted less than a second.
On the return journey, once again over Onslow, we had a double FMC failure. Again there was no serious adverse reaction on the aircraft other than what you would expect with a dual FMC failure. It took about 5 minutes to get one FMC back up and running. The other would not come back online.
These events were also considered during the QF72 investigation.