I have a Jayco 306RKDS and the lever mechanism has come loose from the vent cover and thus the knob which opens and closes the cover is not secure. How do you get past the plastic frame of the fan housing off so you can get to the lever mechanism? It appears that the screws holding the lever to the cover came off.
You cannot get to it from the roof either.
I hope my explanation is not too complicated.
john