For Tim, @Shirleyb21 and everyone else in this situation. After reading this thread this morning I contacted MS via chat support right away.
I explain the issue and that i read this thread and learned that this is a manufacturing defect. I explain the yellow stains and the bulging which I haven't actually notice before reading this, since in my case is in the back so is hard to see. idI In't
bought my device brand new from MS, I bought it used on Ebay and I'm at least the third owner. I explain also this to MS representative.
So MS confirmed that they could replace my unit free of charge if it is within 3 years of original purchase which luckily I am. I had to submit pictures of the defects, and Im going to return my device by mail and get a replacement at zero cost. MS have
been super helpful so far, I didn't even bought the device first hand nor knew when was it bought originally and they find that out for me.
I'm currently not in the states so this replacement might take some time, but I'll try to keep you guys updated on the development of this. MS also told me that the important part is I report the incident whitin the 3 years period so Shirley should be covered,
even if the actual return of the device comes after.
And Tim, here is a pic of how the stains look in my device, if yours are similar is definetly the same issue, contact MS right away