I guess that the answer to the question is that they don't really know themselves. The fixes may be relatively easy or require major reworks and add to that the fact that fixing one thing can break another. (n.b- this is based on what I've read about software development, I wouldn't know a block of computer code from a hole in the ground)
Giving any sort of timetable only puts them at risk of missing the deadline and getting caned for it.
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