First, I'm sorry to hear that you're having this issue, but glad to see you've got a repair on the way.
I'd always suggest the standard recommendation: If it makes a noise, shows a symptom, or displays something wrong, usually more use will not help, and perhaps damage something further. That advice usually does well, but without knowing what the diagnosis is, I don't want to suggest something that would potentially damage it further.
I'd say check with your technician first if the problem has been diagnosed. Until then, hold off.
I have a new 63 inch plasma which devloped horizontal blak lines on the bottom third of the screen. The problem has been diagonsed and I am awaiting repair. I was wondering if it is o.k. to watch until repair is made. Thanks