https://www.theregister.co.uk/2020/01/17/boeing_737_flaw/

Boeing today said another software flaw has been spotted in its star-crossed 737 Max.

The bug was found during an audit of the passenger jet's on-board technology, held last weekend with America's aviation regulator. These technical reviews are expected to turn up glitches and gremlins for Boeing engineers to fix, so this is kinda to be expected.