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The New API seems to mix up some of the input indexes,

NT = ABS(GET_TAPNO(GET_KNUM(KM))

Is the index needed to access the transformer tap positions, this is indicated as the branch array index, but it must be something else like the tap array index. @perolofl answer on https://psspy.org/psse-help-forum/question/10455/model-writing/, had the correct solution, however I read over it too quickly and missed the TAPNO call which the explaination for which is a bit confusing in the current version. If anyone is still able to let me know if the PFMODE and DSMODE can still be used in V36 that would be appreciated.