AllanJ, I did indeed do that yesterday afternoon, and that pump does respond. However, I discovered that it doesn't always make that grinding noise. So, it's not a consistent problem. Still, it's something we'll want to address sooner rather than later. The more I think about it, the more I feel like I might be getting into something a little over my head, and that it might be prudent to bring in a pro. Too bad none of gents is in Minnesota!
Does it only make the noise when you've used the bathroom but not the washing machine? Then the obvious question is...what kind of diet are you guys on? Lots of fiber or meats? Lol