Thanks for all your help guys!
Looks like i will keep hunting ebay for a older stereo, they are quite rare though!!
Just out of interest, does anyone know how much the dealer may charge to repair the unit, and would they give any concession as this is a known problem with the stereo unit. I have heard some people get some joy through the lexus cutomer service line, but i am not sure if this will help as my car is out of warranty....
Ashok