Here in Australia, DA is serviced by Ian Howard in Brisbane. I bought my engine second hand, and after I'd bought it, I read about the issues some were facing.
I decided to have all the upgrades done on the engine, and generally give the engine an overhaul, if it was needed.
I expected to pay for this, as I was not the original purchaser, but I was informed all the work was under warranty.
Not only were all the mods carried out, but a new spark plug, cap and boot, and HT lead were installed.
The mods took a little while to carry out, as parts had to be ordered in from the US, but the engine was back to me in two weeks, complete with a DA beanie and letter of apology for the length of time it took to return!

Now that is service!
Well done Ian and DA service. I'm a DA man from here on in!