Could be that the motor is not sitting straight, instead it cuuld be tilted and when it pumps, it vibrates and makes a loud noise. Or could be something stuck on the impeller or pump cover plate. Pry open the lid with a flat head screwdriver then remove the motor and pressure chamber, therefore you can inspect it. Good luck.
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Please descibe noise.
We need more information then this......
What kind of noise? Is it flushing? Is it not flushing? Are there any other problems associated withthe toilet?
Pump still appears to be working, though seems to kick in later, and is much louder and vibrates
Pump appears to be working, but a bit slower kicking in and louder and vibrating
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