ILUVMILS,
I for my part will close the subject of customer service for a high end priced Mercedes motor vehicle.
Perhaps, there was only one person that complaint about his engine, at your shop.
I admit, that sometimes something goes wrong in a production run and someone installs the wrong bearings, but this is rare in my experience.

Using the Internet as a research tool, reveals that there are many complaints about this issue. Unfortunately, they are not in tabular / statistical form, they are spread all over the internet!
The unresolved complaints I found, aren't limited to just the M272 but also in regards to other Mercedes models.

Although, it is nice to see that a shop, actually volunteered to repair a possible design flaw, but if your shop needed the main office to have a fix submitted, I just don't know about Automotive repair anymore.

To m.akasha,
if the oil pan can be removed without the removal of the engine (probably not, depends on the oil pump and cross members), sorry I never had a chance to look at this model, you may be able to exchange the shells from undeneath the vehicle. However, since you probably have to remove the crank shaft to gain access to the upper shells (bearings) there maybe a number of covers, timing chain (if there is one) seals and other supporting components, to be removed. This is much easier to do if the enngine is removed. Also, it is better during the re-assembly to have a clear look at the components to perform a clean repair. e.g. placement of seals, bearings seated correctly etc.

__________________
Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!

95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert