If in a slide then the Fans MUST run. If not you will experience what you have POOR cooling. Your RV is 5 to 6 years old and that is about the lifespan of the fans and the fan tstat. Odds are the Fans will run and your Fan tstat is bad. BUT, I would replace BOTH Fans and the Fan Tstat.
Bad news is, the refer has to be pulled to do the 2 fans. You should be able to bypass the fan tstat since you have the upper access door without pulling the refer, and if the fans then come on, try to get a time to pull the refer and replace the fans. Doug