NHTSA Complaint #11554600 — 2014 KIA SORENTO

I have a 2014 Kia Sorento with a 3.3l engine. There was a catastrophic blow of the head gasket that resulted in engine temperatures spiking while driving on the interstate. This led to excessive deceleration and stopping on the side of the interstate. After researching, this is an ongoing problem with this vehicle. It even has a nickname, "Soft Block", from KIA using substandard materials to build their engines. I submitted a complaint against Kia through the NHTSA website on November 10th. Since that time, I have come to realize that Kia has issued a warranty extension for 2016-2017 Kia Sorento's with the 3.3l Lambda engine for cooling leaking and head gasket issues. What would be the process for expanding your open investigation (NHTSA Action Number: PE23019) to include the 2014 and 2015 model years of the Kia Sorento with the 3.3l engine? This is the exact same engine, and these exact same issues are prevalent in these years as well.