A photo obtained from Boeing shows the door plug reattached to the plane without bolts that were intended to prevent the door plug from moving vertically.

https://www.king5.com/mobile/article/tech/science/aerospace/boeing/ntsb-preliminary-report-boeing-737-max-9-incident-alaska-airlines-flight-1282/281-1d0975c3-d658-4867-ab3a-b260ab5fe494

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Here is the NTSB's preliminary report into the door plug blowout on a 737 Max 9 jet in early January.

https://www.king5.com/mobile/article/tech/science/aerospace/boeing/ntsb-preliminary-report-737-max-9-blowout/281-c1650f73-6473-49a1-8a42-da157166c43e