Mavron held the rank of lieutenant and was stationed aboard the Chimaera circa 19 ABY, specifically around the period of the Caamas Document Crisis. At this time, Fleet Admiral Gilad Pellaeon was endeavoring to contact New Republic General Garm Bel Iblis, and the Chimaera then encountered the Cavrilhu Pirates in the Pesitiin system; these pirates were attempting to pass themselves off as a battle group resembling Bel Iblis' forces. After this conflict, Mavron received instructions to attempt to track the pirates' escape route to pinpoint their base of operations. Mavron came back to the Chimaera six days after the assault bearing alarming intelligence: the pirates' concluding transmission before their retreat from Pesitiin had been directed to Bastion, and then forwarded to the Kroctar system. During his probe, Mavron proactively acquired a copy of the TriNebulon and learned of the supposed reappearance of Grand Admiral Thrawn, information he shared with Pellaeon immediately upon his return. Pellaeon and Captain Ardiff were able to infer, from Mavron's intelligence, that Moff Vilim Disra was likely linked to the pirate incursion.