This is the best summary I could come up with:

National Transportation Safety Board chair Jennifer Homendy told the Senate Commerce Committee on Wednesday that Boeing has not revealed who was responsible for failing to reattach the door plug properly at the company’s factory near Seattle.

The NTSB said in its preliminary report last month that four key bolts which are supposed to hold the door plug in place were missing when the plane left Boeing’s factory last year.

The report found the door plug was opened to allow for repair work on misdrilled rivets on the fuselage while the plane was being assembled.

“Are you telling us that even two months later you still do not know who actually opened the door plug?,” asked Senator Ted Cruz (R-Texas), the committee’s ranking member.

“Since the first moments following the Alaska Airlines Flight 1282 accident, we have worked proactively and transparently to fully support the NTSB’s investigation,” said Boeing’s Connor Greenwood.

"Early in the investigation, we provided the NTSB with names of Boeing employees, including door specialists, who we believed would have relevant information.

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