This version has it as being production maintenance. If demand...

This version has it as being production maintenance.

If demand was as weak as some make out, why isn't there oodles of spare conversion capacity that was built on the premise of much stronger demand conditions? and if there is oodles of spare conversion capacity, why does a single producer removing some for production maintenance cause this price response?

Quite possibly because demand isn't as week as many have made out and it is using up the existing capacity. While there is (or was) enough capacity, the supply/demand position is far more closely balanced than the general western media consensus. Further price increases may be much closer than many predictions.