The next week I got an email with a link to a FedEx label. They picked it up a few days later.
One week later I received the scope back and it was working!!
Looking through the option slot at the back, it seems like they changed the main board.
The note with it said "Repaired against service note DSOX2002A-06A". So it was repaired for free and outside of warranty (I received no invoice).
Why couldn't tech support have mentioned any of this on the phone? I thought my scope had been written off.
Whilst I really appreciate the free repair, I will have to think twice before buying Keysight again. It seems that if it is out of warranty, then it is a write off. I can't afford that.
A special thanks has to go to DanielBogdanoff for his assistance as I may have thrown it away if I had not known about that service note.