I know of no remanufactured pumps.
That's not to say there are none available, so I'm not aware of it. I've seen used pumps available, but they are very expensive.
Replacing the seals are an easy job.
In the image below, item # 9 & #10 are the culprit for introducing hydraulic oil into the engine sump. Although while the pump is disassembled, you may want to check the condition of the pump shaft(#3) and bearings (#11 & #15) and replace if necessary.