I had a DB error code on my DVDR77.
I spoke to a tech here in the states (who even asked
another tech nearby). They're familiar with the AB codes, but not the DB's. They were stumped. I originally got this code once a few weeks ago. Then it was fine for a few weeks. Then, out of the blue, it cropped up again. It turned out to be the same DVD+RW I had used a few weeks earlier (I had it marked). The other numbers on my code were different from yours though.