The log files on Windows are stored in a common location.

%LOCALAPPDATA%\Plex Media Server\Logs\PMS Plugin Logs\

Using the Finder's "Go" menu, select Go To Folder... then enter the following in the dialog box that pops up:

~/Library/Logs/Plex Media Server/PMS Plugin Logs/

Note: Server versions prior to 0.9.16.0 will have logs located at ~/Library/Logs/PMS Plugin Logs/ instead.

In general, the Plug-Ins folder for the various Linux versions of Plex Media Server will be found under:

$PLEX_HOME/Library/Application Support/Plex Media Server/Logs/PMS Plugin Logs/

The log file will be named `com.plexapp.plugins.plexrequestschannel.log` or `com.plexapp.plugins.requestschannel.log`

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^{Taken from https://support.plex.tv/hc/en-us/articles/201106148-Channel-Log-Files}