Generally on these pumps, it's the reservoir gasket (big O) that leaks, if anything, and you'll see the fluid on top of the housing down to the lines. If the front seal is leaking, the fluid is on the front and bottom. Also, if the front seal is bad, there is a possibility that the bearing is worn. From your discription, the bearing is OK. 1 mm axial play when you pull/push on the pulley is normal.

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