You're right; D0C4. Sigh.
It's a unit I swapped into my 15" 800 MHz TiPB.
(I was really pissed off that Apple refuses to provide a firmware updater to fix the bug(s) which prevents Retrospect from actually burning disks with the provided CD-R and always wanted to do some family DVDs...)
I read that thread, but didn't see any answer whether there are updaters. I could use a faster burn speed and DVD-RAM, as could a lot of other people.
I tried emailing you, Eug, but you've got email turn off in your prefs.