SpaceX is changing two of the SN9 engines, with number 44 swapped out today. According to Elon there were small issues that arose in the three static fires that required removal to fix. You can hear the abnormal shutdown "honk" from one engine during one of the tests. This has happened previously on SN8 and its not a significant delay, they have spare engines onsite. However it does mean that new static fire tests will need to be conducted prior to the flight. So watch for revised test info soon.
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