Ah, other comments indicate a breaker was pulled for other acceptance testing.
"This is apparently exactly what happened. Circuit braker wasn't replaced after an acceptance trial flight. Aircraft was on the ground for a few hours while mechanics ensured that was the only failure in the system, and the aircraft was returned to service later on the same day." by DERP Squad under
https://www.youtube.com /watch?v=3FZ5O2SXuFM
(remove the space in the url - it's the comment, not the video that's the focus.)