Switch panel help
so this is an '05 34rgts cedar creek 5th wheel, and the prior owner went thru this, but wasn't real comfortable with what all the switches were. I've looked thru the owners manual, but didn't see a clear layout /description of these. Most are self explanatory. For instance, from top left - clockwise - Fan, levels of tanks/battery (what's a galley tank? - fresh water is above battery) bottom left is Heater(water ?) and right is pump (for what?) then there's a "tank heater" label (?) is that for the single red button? how is that different then the one above? next is glide in/out - easy enough - then the 4 buttons - for lights - right is internal lights, other 3 are external. Above that, the single switch apparently turns on /off the glide in/out motors?
How close am I ? Any help?