I'm not so sure that they would have had to pay damages. It is true that they were pressuring Germany to certify NS 2 (one explanation is that NS 1 had long term contracts whereas NS 2 would have been higher spot prices).
But the danger of NS 2 certification would also support the U.S. involvement theory.
To all others who focus on NS and Germany: There are a multitude of Russian pipelines through Poland and Ukraine that are still operating. Ukraine collects transit fees for Russian gas as we speak.
So the theory that the attempt was to destroy specifically German/Russian relations, which had been a stated goal of U.S. foreign policy for decades, is pretty solid.
I don't expect much from the Swedish investigation. Another such investigation was the sinking of the MS Estonia. Figures like Carl Bildt (who is now a war hawk) went on to the RAND corporation. Sweden will do what the U.S. prescribes.
Stop believing conspiracy theories. The investigation into the sinking was well executed and most likely correct. Estonia was also never covered, they started the work and then aborted it.