I put in a new Korky fill valve about 6 weeks ago. All was fine but in the last few days I have started noticing some humming noise as can be heard in the video - at first it was making the noise at the very end of the fill cycle, now it seems to make it mid-point of the cycle and continue through the cycle, which I assume is a sign of things getting progressively worse. If need be I have no problem returning the valve and replacing it, especially since it is only 6 weeks old. Just want to confirm it isn't something else.