The overspeed governor looks to have activated, check switch A for open circuit to confirm then refit the red/black wire. Re-engaging is a simple job, providing the hold off bar has not been damaged, knowing why it has done it in the first place is another matter.
Could have been due to running the lift without the case and limit paddles in place which would also explain why the charge pickup looks like it is stuck in, probably bent, try pushing the 8mm nut back towards the switches to check.
Ultimately you may have to remove the nut and pull it out to straighten or purchase a replacement. If so take care to observe the positioning of the switch activator on the shaft to ensure it activates the slowing switch before the final limit switch.
