Hi Ann and Ron, No, that does not sound common. Sounds like you pulled the belly pan down and found fluid leaking from one of the pistons? It was a metallic clunk? Sounds like you ran it for too long, the pump will begin to labor (noise pitch change) when it encounters the end stop which is when you should stop pushing the out button. If metallic clunk then you snapped the end stop which could have also blown the seal in the piston, hence the fluid leaking. I would expect these can be pulled out, disassembled, new seals installed and reassembled. Then the metal end stop should be repaired or replaced not sure what your model looks like.
Good luck,
Chuck
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