Thunderbolt screen backlight failure and mis diagnosis

Hi,
Here is one for the community.
My 27inch screen started playing up and losing the back light. The only way to get it back was to disconnect from my mac mini and re connect again and it would bring the screen to life for a short time, progressingly getting worse.
After contacting apple they agreed to diagnose it and tell me that thee problem was the LCD screen at a replacement cost of £997, obviously mine was under warranty so was replaced at no cost.
Imagine my surprise when it started happening again a few weeks later. After contacting apple again and doing some research i advised apple that having changed the screen i would be tempted to start by checking the cable which is a standard cable connecting internally to the logic board. after that i would be looking at the logic board as two of the chips provide power to the backlight.
The apple tech who was based in LA agreed with me and said he would advise the repair centre on the notes to do as suggested.
So my repair went off two weeks ago with the promise of fixing it pretty quick, knowing that a cable change and a logic board would take a maximum of an hour to do.
After checking yesterday the repair centre told me we have ignored your advise, but done our own diagnostics and have concluded that the screen is faulty!
So even after telling them "you changed it a couple of weeks ago!" please test the logic board and the cable!  " sorry sir we use apples computer diagnostics which tell us which components has failed, on this occasion it tells us the screen is at fault.
That was yesterday, Today the manager rang and told me hey! guess what..... we replaced the screen with a brand new one, tested it and it still does the same thing and loses the backlight! so again i said test the cable and logic board like i said two weeks ago.
They have changed the £5 cable and so far after a day on test its ok.
So my annoyance is the Apple software test!! how could it give a fail to the screen when the cable is nothing whatsoever to do with the screen?
Does anyone have a copy of this program? i am a programmer and want to look at this to find out how it mis diagnosed this issue.
How do i complain to Apple about this obviously useless program their repair centres are using?
Any help appreciated

Thanks for the responses.  I figured it was defective but was hopeful that maye it wasn't.
I'm past the 14 day mark, but at this point a refurb is better than what I have.  It did it a couple of times right out of the box, then stopped.  At day 14 on the dot it started failing everytime I used it, that's when I did the factory reset and it seemed okay for a week or so.  Yesterday it went out again and hasn't worked right since.  <sigh>  Really disappointed, I could have picked the Charge or Revolution but went with the TB because I like the HTC look and feel better.  Regretting that decision now.
I'll take it in this week and see what can be done.

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