Search for the following classes in code. Check that they are not used anywhere. tool_lp\external\cohort_summary_exporter (this will showup in upgrade.txt only) tool_lp\external\course_summary_exporter (this will showup in upgrade.txt only) tool_lp\external\course_module_summary_exporter (this will showup in upgrade.txt only) tool_lp\form\persistent ltiservice_memberships\local\resource\linkmemberships ltiservice_memberships\local\resource\contextmemberships ltiservice_profile\local\resource\profile ltiservice_toolproxy\local\resource\toolproxy ltiservice_toolsettings\local\resource\contextsettings ltiservice_toolsettings\local\resource\linksettings ltiservice_toolsettings\local\resource\systemsettings scorm_graph_report scorm_interactions_report scorm_objectives_report