I'm still searching for the answer.
Found out how to remove the headunit on youtube
(Removal and Installation of Lexus IS250, IS350 Radio, Navigation, Display, Year 2006,2007,2008 - Uploaded by HiTechElectronic on 7 Jul 2011)I thought this might help me to check and remove any CD's/DVD's if stuck - Not quite what I am looking for.
Anyone know what I can do apart from spend money I haven't got?