As mentioned there is a plate to access the bearing snapping hidden above the mount... Those can leak.. But far more common is the rear band anchor pin... Which is just forward of the rear mount...
The plate in question is the cover for the clip on the rear support bearing. Many times these are a cork gasket and tend to loosen over time. You will need to remove the mount to get to the screws.
On that rear band pivot I always silicon over them and they wont leak. Even with a new o-ring they tend to leak.