New/First time owner of 83-84 Rockwood RV

Thanks for the info guys! I have downloaded manuals for all of the appliances,pumps,ac,etc... amazing what you can find online. Theres under 30k on the rv and the undercarriage and engine are very clean. Im currently in the process of changing out fluids and a general tuneup. One leaking window that produced minimal damage is all I've found so far. Im going to do any repair myself with 20 years in mobile home repair and construction I'm confident I can handle most issues I encounter. I've traced and identified all but a few switches. One I'm not sure of is next to the bathroom door about 2 feet off the floor. Its an on off switch.? Seems like an odd location. Also, any recommendations for online stores for parts and resources?