Verizon FIOS Gigabit ONT pairing at 100Mpbs

"When you upgraded, did they install a new ONT? What wired speed do you get when you connect to the ONT? I suggest changing the network cable that is connecting the ONT to the RBR50 and rebooting the ONT to see if it corrects itself."

1. He said he had to change a board, but not the whole unit. Since I'm high risk for COVID, I was not in the same room.

2. I haven't found a place to plug an ethernet cable directly inside the box, but I'll try that tomorrow with better light.

3. The cable currently serving as the connection is a very, very long one running outside the house from front to back and up a floor. I'm hoping that's not the issue, though I have my suspicions. Guess I can look into a different arrangement if #2 is working. But the phone connection is running the same route due to limited wiring in the old house.

4. Thinking I'll try rebooting the ONT independently as well. Is that a "power boot" on these or is there some kind of a reset button?

Thanks. That gives me a few things to try!