Getting inside CIV3D can be difficult often answers are not where you think they are, even the toolspace names do not match database names.
I would (vlax-dump-object (vla-getinterfaceobject *acad* (strcat "AeccXUiPipe.AeccPipeApplication.12.0"))) as a start. Careful 12 may change per version, 2019 2020 2021 etc