The Russian docking mechanism had to be taken off the vehicle so a faulty switch could be replaced.

BBC: RELATED BBC SITES

Assuming the manual docking goes as planned, China can check off another item on its to-do list as it moves forward with its plans to build a permanent space station.

FORBES: China's First Manned Docking Mission Is a Success - So Far

Some additional maneuvers and engine shut-off checks are expected before the final docking sequence.

WSJ: SpaceX Craft Rehearses Moves