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If this problem hasn't existed since day one, above poster is correct, not covered under warranty if waste debris is lodged in the valve seat.
definately try flushing system by filling with water and dumping the tank at high flow rate several times. Could be TP stuck in valve seat.
This happened to me twice and both times it was a baby wipe (they done break down.... Darn kids). I had tto remove and clean the valve as flushing didn't work.
Are your valves cable operated?
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