Hello!
Originally Posted by FAA Proposed AD justification
The investigation determined that over a long period of low power fuel flows and low fuel temperatures associated with cruise flight, ice can accumulate in the main tank fuel feed system and then release as a result of increased fuel flow when high thrust is commanded.
and later :
We have determined that the loss of engine thrust was likely due to ice accumulating in the main tank fuel feed system during long exposure to cold fuel temperatures and low power fuel flows. It is necessary to issue interim mitigating actions in order to prevent an additional accident.
Emphasis of mine.
Virtually identical ice release both sides, causing virtually identical fuel restrictions?
I have the feeling that they do issue an AD, for the shake of "doing something" ...