Check the nuts and bolts on the pump as they may have came loose during shipping. Also, when it was assembled, they may have actually leave the nuts and bolts loose intentionally to allow the seals to expand and contract before the pump is actually used. Once you have checked the nuts and bolts and tighten any that need it, the seal should swell and the leaks stop fairly quickly. However, you can prime the pump with very warm to almost hot water which will aid the swelling of the seals quickly. It seems that many times when I take my' highbanker/dredge and pump out to get Gold, I always have to retighten a few nuts and bolts on the pump due to them vibrating loose on the previous trip/run.
Now, if you do the above and it never stops leaking, then contact the Seller or Manufacturer of the Combo to get replacement seals.
Frank