Do a search on this site for air filter replacement. A forum member posted, with pictures, his experience replacing an air filter on a Winnebago 36G (I think). The job is pretty straight forward, just awkward at times.
To reset the filter minder, just push the button on top.
'07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X
Blue Ox, Aventa
US Gear UBS