I am sorry I can't speak to your specific motorhome but the pressure switch is usually located on the dryer for convenience sake(theirs, not yours). It is usually a 3 function switch: low pressure protection, high pressure protection and a pressure override for electric fans or fan clutches. That means that there may be nothing wrong with yours since you should not have current when the system isn't in a high head pressure situation.
In addition to the fuse, you probably have a relay. I would think they would be located wherever Freightliner mounted their fuse panel. The fuse and relay location is dependant on who did the install. Condensers now routinely come from the chassis supplier. That was not always the case.
Gary & Leigh
2017 Entegra Cornerstone 45Y
2011 & 2014 Entegra Anthem(Sold)