I replaced all the seals, etc, when I reassembled the pump and mounted to the new pump housing. Everything was dry for a week, but now I have water leaking from the bottom of the pump motor behind the 4 faceplate bolts. I did not replace the impeller itself, but did replace the shaft seal, the impeller ring, and the diffuser O-ring. Could the impeller be defective and causing the leak? Any other thoughts or suggestions would be appreciated.