Different but similar failures in US
First time poster here, and not a pilot, but... I just noticed this in an article on the Guardian. Doesn't sound like MCAS, but perhaps another example of "un-wanted" automation trying to bring a plane down. Apologies if this has been posted before, but I haven't seen it yet on this (fascinating) thread...
"Two US airline pilots filed voluntary safety reports last year to a database compiled by Nasa, saying an automated system seemed to cause their 737 Max planes to tilt down suddenly.
The pilots said that soon after engaging the autopilot on Max 8 planes, the nose tilted down sharply. In both cases, they recovered quickly after disconnecting the autopilot.
The problem did not appear related to the automated anti-stall system that is suspected of contributing to a deadly October crash in Indonesia."