Interesting read, so maybe I should save myself the pain and just straight swap with a new dg2813.
I'll compare beats (from memory) when my new ETA rep arrives.
I'm undecided about dealing with ETZ again. Now that I've read/know a lot more, it's become clear that my N00bmariner is an absolute dud, with so many flaws that shouldn't have been cleared by QC. In fact, it's obvious that the check list it arrived with was just filled out favourably regardless. It has very little in common with the n00b reviewed by By-Tor.
Thanks for all the input guys, much appreciated.