User can view history of an issue through Plan Viewer and Listing.
PLAN VIEWER
1. Click 'Plan Viewer'.
2. Select unit.
3. Click any marker.
4. Click 'History'.
LISTING
1. Click 'Listing'.
2. Click 'Issues'.
3. Click any issue status.
4. Click unit.
5. Click any issue.
6. Click 'History'.
