Would really like to bust MB Encino on this

Driver side cam mag's leaking and there's oil in the black plastic connectors pictured below. MB encino said they replaced the defective cam mags in July of 2011 under an open campaign and MB USA says they won't cover the cost again.

I'm having trouble believing if it was really replaced 2 1/2 years ago that it would be leaking again, so based on the part number written on the cam mags, can anyone tell if this this an updated part number or one of the original defective Cam Mags??