Grey water tank drains slowly on Fleetwood Discovery 37V 1999

Grey water tank drains slowly on Fleetwood Discovery 37V 1999

by John Dekkerr
(Rainier, WA USA)

The grey water tank drains very slowly. I have replaced the vent check valves under the kitchen and bathroom sink. Vent cap is attached to roof and I hesitate to remove it. Any suggestions?

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