Welcome to iRV2. Consider posting this question in the Fleetwood Owners forum on iRV2. On the iRV2 main page and scroll down about 1/2 way. You see the owners forums. I suggest this because your question is specific to your Brand and Model of coach. I could provide some generic things to check, but they might not apply to your coach. Nobody knows your coach like somebody who owns one just like yours.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours