The only thing that puzzles me is that the HUMS was damaged from sea water. Correct me if I'm wrong, aren't they supposed to water proof to a degree?
No - why would it be? HUMS cards are meant to be downloaded from dry, serviceable aircraft. It's a maintenance 'tool.'
JW, I think you are being a bit harsh. Interim reports always look similar to this. They simply state a few established facts and the detailed analysis comes later. Sometimes, if there is compelling evidence, they may make some interim recommendations.