Here's a minor elaboration on that tweet:
>"Switches that should have indicated that the cover rolled up did not trigger when they were supposed to. However, secondary and tertiary sources offered confirmation that it had. Temperature data seemed to show that the sunshield cover unrolled to block sunlight from a sensor, and gyroscope sensors indicated motion consistent with the sunshield cover release devices being activated."
https://blogs.nasa.gov/webb/2021/12/31/first-of-two-sunshiel...
