Hi Dom,
PatchDownloader.log provide information about the process for downloading software updates from the update source to the download destination on the site server.
You can check EndpointProtectionAgen.log and MPLog-XX.log after using SCEPInstall.exe /ForceClean.
For more details:
https://www.prajwaldesai.com/sccm-log-files/#Software-Updates-Client-Computer-Log-Files
https://www.prajwaldesai.com/sccm-endpoint-protection-log-files/