Furnace not sending heat to front of 5W - Is it broken?

I just noticed a lack of heat to the two registers in the bath and bedroom above in our Keystone Outback. I got underneath the upper duct by removing a panel in the basement and the flex tube connecting the lower and upper duct had become disconnected. The flex duct had only been taped to the rectangular metal duct. I zip tied it back, then retaped with duct tape. Good air flow and good heat to the upper level of the 5th wheel.