Robert Comsol wrote:
because the repair job of a ship that just arrived could hardly be already 83% complete.
Actually it can. The Enterprise was damaged in the ion storm and made her way to the Starbase to complete
her repairs. She could've started her repairs out in space and by the time she arrived at the Starbase, she was 83% complete in her task list of repairs to be made.
The possibility of the "% Complete" on that chart to mean "under construction" is probably very low because the Enterprise is on that same chart. She would have to be already completely constructed in order to undertake her various missions prior to this episode.