We’ve had a vax rapid power carpet washer (model CWGRV021) for several years which has worked mine until now. Since last week when you put the fresh waster tank on it starts dripping from the nozzles underneath without the trigger being pressed even when it’s not plugged in. It flows out faster when the trigger is pressed so I guess something isn’t sealing properly. The tank sits on a rubber seal where the water flows which seems intact. Has anyone experience similar? I can’t find any service manual or guides for the model