You're aware that there's a class-action lawsuit regarding the balance shafts, and that it includes vehicles thru 2010, right?
I can't believe that you'd say that I've been replacing balance shafts for the wrong code. You shouldn't ever replace ANYTHING just because of a code- especially not something that expensive and potentially harmful if misdiagnosed. I've replaced balance shafts because they're faulty and worn out, causing the camshafts to go out of adjustment. I have yet to pull apart a 272 that I diagnosed as having a balance shaft issue and find an undamaged balance shaft.
ANY codes regarding the camshafts being out of adjustment can be caused by balance shaft.
The initial few service bulletins apply to all fault codes relevant to camshaft position, including P0015 thru P0017, as well as P0021 thru P0025, P0059, P0060, P0064, P0272, P0275, and P0276. I notice the bulletin you posted is from May of this year, which is interesting...it also only mentions 2 codes in the title of the bulletin, which is also interesting.
The fault may or may not read on one or all of the camshafts. When the balance shaft gets chewed up it causes slack in the chain, and will let one of the camshafts get out of adjustment ever so slightly. Doesn't necessarily have to read on all of the sensors - doesn't even necessarily have to have a code at all. The best way to check is to clear the code and start the vehicle, and if the code doesn't return immediately it's more than likely a solenoid or a sensor. If it DOES return before you can drive the vehicle out of the shop, it's the balance shaft.
Quite frankly, I'm surprised that a dealer tech would say that it only happens on 2006's...the first bulletin for the balance shaft issue didn't come out until 2009, and it included ANY fault code related to the camshafts...another bulletin that came out in later 2009 went on to include any multiple faults stored in the DME! But then again, Mercedes has denied it so long and refused to admit that there was ever an issue to the point that there's a gigantic class-action suit going on against them for it. Like I said earlier, dealerships equipped with naive, underexperienced techs that know everything there is to know about everything is the reason that I make an honest living. Keep it up