Changing gaskets in April this year did not fix the leak in the macerator. I should have checked more on Youtube about macerator overhaul. But at last I bagan suspecting another reason, and in particular the motor shaft seal ring. (11)
This was the only probable reason beside the gaskets. And removing the seal ring revealed that it was stiff and worn. Also, the inside tightening spring was rusty and probably inoperative.
When installing the new ring, I filled the spring with grease, hoping that it will prevent rust for a longer period. The next summer will show if the leak is stopped.
And testing in may 2019 it looks very promising. No leaks any more.
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