This was posted in the A3 forum and just wondering if anyone has tried this and had success??
""Dont let the Audi garages fool you, the whole cluster does not need changing. Mine did exactly the same thing, worse on hot days, better on cooler days. Audi also said change the cluster, I thought forget it! I took it out, there's 3 plugs on the back. Turn it over, there's a few torx screws, take those out, and loosen the black clips which hold the clear face to the rest of the cluster.
What happens is the lcd display glass has a thin ribbon cable on its right hand side that powers the display, the bonding/glueing on this ribbon cable comes loose, doesn't make proper contact thats why the lines come and go.
Over the top of the display is a metal cover plate held on by 4 legs bent on the back of the pc board. Straighten these, and it comes off. WORK GENTLY!!!
Then you can remove the lcd glass. Be careful, don't loose the 2 pieces of plastic behind the lcd glass. IT WILL NOT WORK WITHOUT BOTH OF THESE.
Then, either take the lcd panel to a good electronic company to re-bond the ribbon cable for you, or find a place that makes and sells lcd displays.
Don't worry about the codes either, so long as you disconnect the cluster with the ignition off, once you plug it back, everything will work fine.
I did mine myself, just added 2 extra strips of thin rubber strip behind the lcd on either side, and made the metal cover press down slightly harder on the ribbon cable so it makes better contact, and it works perfectly. All in all, an hour or so's work.""