Fedorov is on the money. I would be checking all the glued internal threads for the ride plate. If you have removed the ride plate once or twice, the glue can crack causing a slow leak. Easy to fix with a bit of sikaflex. Also, another common problem is sometimes when people remove the pump unit and install it again without greasing the spline, you can push the 2 O-rings out of the short shaft meaning the water will sit up in there until it corrodes a hole in the drive coupler letting water in.
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