https://www.thejakartapost.com/news/...or-checks.html
Indonesia’s air accident investigator has sent five components of a crashed Sriwijaya Air jet to the United States and Britain for examination, including the autothrottle that controls engine power automatically, the agency’s head said on Tuesday. The 26-year-old Boeing Co 737-500 crashed into the Java Sea shortly after takeoff from Jakarta on Jan. 9, killing all 62 people on board. National Transportation Safety Committee (KNKT) Chief Soerjanto Tjahjono told Reuters the components had been sent for examination to help find out why an autothrottle parameter had changed. He did not identify the other parts.
some possibility that parts like the engine FCU may be examined for mechanical and operation issues (sticky valves ?)
Some times there are issues about the fuel itself and the best place to get a sample is from the undamaged innards of the FCU on an engine. Any issues involving the FCU include before disassembly x-rays of where the valves are set.
I guess we'll just have to wait for an interim report before second guessing why they are sending parts to the US