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Windchill log files are in WT_HOME\logs (You've got MethodServer and BackgroundMethodServer log files)
WindchillDS log files are in ~\WindchillDS\server\logs (Access logs and error logs)
Apache log files are in ~\httpserver\logs (Access logs and error logs)
Solr log files are in ~\solrserver\solr\server\logs (solr.log)