Go to http://www.tantht.blogspot.com/ . He has excellent instructions for dismantling an optoma projector. However I took it one step further. I still had a problem with overheating due to dust after I followed his steps twice. Then I also removed the back of the projector which gave me much better access to an internal fan. I could see a substancial amount of dust coming out when I blew compressed air through it this third time around. It has been working fine for 6 months since.

Nice advice Zaine...your a genius.. not - the user guide isnt a technical service manual. Best bet if its still under waranty is to give optoma a call, I have the same problem with an ES526. The colour wheel went out of sync causing the colours to mix up. Checked the lamp compartment and the thing was clogged with dust (only 6 months old).. next time I buy a projector will make sure it has filters I can clean. As for cleaning the optics I would have a chat with a home Cinema/specialist hifi shop - they usually have some good contacts

The internet is a great place to look or the optoma website,i have a optoma es526 and it came with a disc for the manual