Greetings, Just picked up new Roadtrek Adventurous and drove RV back to Jackson Hole from MN, but didn't use plumbing. Once home in Jackson I filled black and grey tanks with water to test system. I opened grey tank value [pull out] and turned on pump by pushing button located next to drivers seat - no water pumped out although I can hear pump running. I then pushed in and engaged device to free clogged pump. It turns with just a little resistance. Still no luck. I hate to drive unit back to dealer to get fixed - not sure if something is broken or I'm I doing something wrong. Help appreciated.