From what I've read, a fix was available in January.Boeing was...

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    From what I've read, a fix was available in January.

    Boeing was going to issue a Notification (not mandatory) but waited on the FAA to issue a Mandatory notice.

    The FAA decision was held up for 5 weeks by the shutdown.

    https://crooksandliars.com/2019/03/trumps-shutdown-delayed-necessary-software

    (Left leaning spin in the link noted; just read the factual bits)
 
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