The door responsible for temporary grounding of Boeing B737MAX9 fleet, has been recovered by NTSB.
Investigators are currently examining the Alaska Airlines Flight 1282 (N704AL) door plug and will send it to the NTSB Materials Laboratory in Washington,DC for further examination.
FAA has issued an Emergency Airworthiness Directive on B737MAX 9 variant for inspection on Plug-in panel.
Source – FL360aero