i sure wish i could be of help with your problem,,,not much worse than a tolet problem,,---i would just replace the whole unit if it were me,,and sanitize the tank,,make sure my vent pipe was clear of obstructions..
best of luck..
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jeff n debbie, and our 4 4 legged family members
68 aristocrat,68 216 winnebago, ancient GTA,1963 airstream,
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