I am attempting to make a slight change to the summary task list portlet, but I can't seem to find the source file. I found the preferences .jsp in PPM/server/kintana/deploy/itg.war/web/knta/drv/portlet and when I run the portlet definition report for this portlet, it tells me the name of the .jsp is SummaryTaskListPortlet and it's in the itg.war directory, but I can't seem to find the source of this custom portlet anywhere.
It's a Java portlet which is stored in some jar file probably. I don't think the sources are available too. You should go for a custom list portlet as this type of portlet definition is not meant to be modified.