Prior to the fatal Lion Air 610 flight one of the AoA sensors was replaced with another sensor which was repaired by a facility in Florida (XTRA) that had no approval to repair this part. It was shown that this particular sensor had already caused a stick shaker event on another aircraft but Lion Air used it anyway. There was no documented calibration check after installation thus the 21 degree difference between the two sensor readings was never picked up. The difference was discovered when the DFDR data was checked after the crash. A 21 degree difference between angle of attack sensors? No wonder MCAS detected a stall event ffs. You guys need to read more and stop watching sensationalist Netflix crap.
Ultimately this sensor precipitated a chain of events that exposed other factors that ultimately caused the fatal crash. Cheese anybody.