The Verge:

The final report cites multiple root causes of the April 20, 2023, mishap and 63 corrective actions SpaceX must take to prevent mishap reoccurrence. Corrective actions include redesigns of vehicle hardware to prevent leaks and fires, redesign of the launch pad to increase its robustness, incorporation of additional reviews in the design process, additional analysis and testing of safety critical systems and components including the Autonomous Flight Safety System, and the application of additional change control practices.  

The closure of the mishap investigation does not signal an immediate resumption of Starship launches at Boca Chica. SpaceX must implement all corrective actions that impact public safety and apply for and receive a license modification from the FAA that addresses all safety, environmental and other applicable regulatory requirements prior to the next Starship launch. 

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MuskWire TLDR:

A final report has been released regarding the mishap that occurred on April 20, 2023, and it identifies multiple root causes for the incident. SpaceX has been instructed to undertake 63 corrective actions in order to prevent a recurrence. These corrective measures include the redesign of vehicle hardware to prevent leaks and fires, as well as the redesign of the launch pad to enhance its strength. Furthermore, additional reviews in the design process, analysis, and testing of safety critical systems and components, such as the Autonomous Flight Safety System, are required. Additional change control practices are also advised. However, it is important to note that the conclusion of the mishap investigation does not mean that Starship launches at Boca Chica will immediately resume. SpaceX must first implement all necessary corrective actions that impact public safety, and then apply for and obtain a license modification from the FAA that addresses all safety, environmental, and other relevant regulatory requirements before the next Starship launch can take place.