Why not try to use ST05 to trace your operation in your calling of transaction "ST03"? and you will find everything in the trace log.
Normally this kind of data is stored in Table: SWNCMONI, detailed log in field CLUSTD, but this table is a cluster table, that means you need to use IMPORT to read the data. For example pls refer to FM:SWNC_COLLECTOR_GET_SYSTEMLOAD line 45.
Hope this can do help.