I am fairly new to m/h and am not mechanicaly inclined in the least so please bear with me. My rear roof a/c is leaking water back inside the m/n when the unit is running. I'm assuming the drain line is stopped up. Is this a fairly easy problem? I mean I have a portable air compressor, is it as simply as blowing the line out? And will I be able to find the drain line easily once I take the cover of a/c off? Any help would be greatly appreciated.