said by Jabbu:
Usually it would be the other way, 177 would be received higher at a box then 717, looks like water damage or a suck out fitting somewhere. Problem is maintenance will need to be on site and have it happening while diag. to find the problem.
That's what I was thinking, thanks for verifying this. When dealing with RF, low frequency tends to come in stronger. Additionally, every spec sheet for coax cable clearly shows that there is more attenuation on higher frequency signals.
I have two lines coming in from outside, and both have the same issue, so I'm pretty confident that the most recent tech is correct when he said that the issue isn't inside.