Everything that we have and know is here:
http://www.digitalfaq.com/forum/vcr-...lo-daytek.html
I sold my heat-modded hacked LiteOn units some years ago, and have forgotten most of what I once knew about them. I wrote a few guides on this site more than 10 years ago. These were eventually migrated into the forum in order to consolidate all info into one convenient place.
There are many attachments to posts in that thread, especially on page 2. Read it all very carefully, and everything you should need is here.
I never did finish my heat mod guide, though I remember exactly what I did. I still have the pictures somewhere. If interested, I can try to dig those out and post on it. You'll need a power drill (to drill holes in the side of the cover), some minor electronics knowledge to add a fan (split a power source, solder new joint), and some RAM heatsinks that you'll need to cut in half with a hacks (and then sand smooth and clean to make sure no metal shaving are present).