I'm currently experiencing an outage with SSE broadband. I was using my own TP-Link router instead of the Technicolour one they provided.
In the course of the conversation I had with them, they said I'd need to use their router so they could run some further checks. I'm sure they only wanted me to tell them which lights were on, but is there any further checks that an ISP can do against the router they provide?
I work in IT, so I suspect this was just another way for them to fob me off.