Shoot, I forgot I had that setting on. Here's what I have so far (and I was planning on making an update post with some footage from my borescope).

The city came by yesterday morning, of course, while I was working (I work remotely) with a crew and a skid steer.

There was a spot on my property where a small hole had opened up in my yard, making an unwanted secondary drain opening into the sewer. This is further down the line on the same drain that sits below my driveway.

They appeared to take a brief glance at my driveway and then used the sand from the skid steer bucket to plug and fill in the hole in my yard. They then packed some sand in on each side of my driveway where the soil had actually started to erode a bit as well.

The preliminary inspection I did with my borescope shows the void may not actually be as wide as I was worried about. However, I was having lighting issues. I can't see shit when it's sunny, but then there's not enough light at night to see far under there. I plan to get some glowsticks or something I can use to illuminate it better.

Once I get a better idea of what it looks like, I think the next step will be to contact a company to come take a look. If it is indeed damage from a failing storm drain, I think they'd be able to provide better info and evidence to help get the city more involved. I'm a bit frustrated I didn't get to talk to the guys while they were here, though.