Iron Man, Vol. 4 #27 (2008)

Haunted, Part 7
Stark, Hill and Dugan are fighting an uphill battle against the United States government as a result of dropping the clean nuke on the Mandarin's facility. (Dugan seems to be really enjoying himself, too.) They are searching for the Mandarin's production facility, which they know is somewhere in China. Maya, meanwhile, is repeatedly visited by Stark, who is asking her for the complete mapping to the Programmed Cell Death she built into Extremis as defense, telling her they need it to produce a counter agent. When faced with evidence that Mandarin's team has, in fact, cracked the code, she gives Stark what he needs, only to find Stark immediately transform into the Mandarin, who thanks her for her cooperation before leaving with the data.
Release Date: 2008