Machaca
What could cause cavitation quite easily is a melting and Refreezing of ice crystals seriously necking down the flow, or even temporarily cutting it off completely.
Fuel in general: Storage, transport, transfer, etc.
BA038: sumping negligence, lack of critical procedure compliance
(Would apply to other carriers of course.)
There seems to be an unwillingness to address wet fuel other than spec measurement and an eagerness to eliminate contaminated supplies. Instead, the drill is "Undiscovered fuel characteristics, etc." at very low temp...
The Trent has an exposure here, vis a vis FOHE and other plumbing.
A very small amount of ice, perhaps present in barely nucleated crystals, could deposit over time in restricted flow areas. In other words, in spec fuel could cause serious flow issues, interfacing with a mechanical system that potentiates it. Follow on melting and refreeze would be indicative of such a concentration, though "in Spec."
I don't recall if anyone has brought up "downstream" cavitation.