Type "Event Viewer" without quotes and launch the Event Viewer.
In the left navigation pane, under the Windows Logs folder, select Application
In the right Actions pane, launch the "Filter Current Log..."
Under Event Sources, choose Winit
Click OK
On the filtered list, go to entries at the time of CHKDSK and look through them for the CHKDSK log
In order to look through each one, you actually have to double-click each entry to open up the details