Hi Alan,
Oh! Dear! Now that sounds serious..... I've never come across that problem before. Sounds like replacement is the only option...
You could try a UK Technics Spares source here : info@wdgreenhill.com they may be able to help.....

The fact that you have two displays with the same problem would suggest a possible environmental cause ?
Are your instruments situated in an area which experiences very high temperatures for extended periods ? I know parts of OZ can get very hot.....

It's quite amazing what high temperatures can do... I left some CDs in my conservatory for several years after 'burning' them and forgot about them. When I discovered them earlier this year, I tried playing them and they were virtually useless!

I hasten to add that this only really applies to CDR/CDRW and not the commercially produced CDs, although I have known some to warp when exposed to high temperatures over an extended period...

UPDATE

Found this on : http://www.mcclainsolutions.com/Articles.cfm?Article=865209
Delamination
Delamination results in the formation of bubble(s) on the external surface of the LCD panel. High temperature, humidity, and/ or improper assembly of the LCD panel can cause delamination defects. Generally, air or moisture is trapped between the front polarizer and glass substrate, resulting in the formation of bubbles.