Do you know how to clear those codes? They must all be read first, then cleared. Once cleared, if and when the LEDs flash again, re-check the codes and see what's current. I'd suspect that most of those are old codes and may not be relavent.
Don't jump to the conclusion that you need a new ECC control unit as that's an expensive guess.
As much as you might not like going to your dealer, most dealers can only charge you a limited amount of diagnostic time to diagnose a problem. Normally, it should be about 1 hour to diagnose that. You can easily spend alot more $$ by guessing if you're wrong.