bsieker #3326, take care when interpreting the FDR trim. The switch position for ‘manual’ elect trim probably has a low sampling rate, thus a single data point would be displayed as a ramp up / down. The important aspect is that there is no change in the pitch trim position.
Thus the indications toward the end off the flight probably identifies reactivation of the elect trim, even two pulses recorded due to selecting the two switches back to an active state; either without further pilot elect trim input by choice, or due to a certification inhibit (? discussed elsewhere), or with manual elect trim, it was not strong enough to overpowered the tail forces (from the crew’s perception the latter situations were of an elect trim fail)
Thereafter, the trim command is only down - elect signal (MCAS), the actual trim position further nose down.
The other important aspect is that with the elect trim inhibited some time before, there was no change in trimmed position; i.e. the MCAS had no effect, but critically there was no nose-up trim from manual trim wheel operation, indicating the crew’s inability to move the trim.