Push up the entire ceiling, going in one direction, then sliding your hands from left to right. Feel for soft spots, bubbles, water damage and erosion. Circle any spots you feel with the grease pencil, so repairs can be made. Check around vents, windows and corners where the RV walls come together. Inspect the corners with the magnifying glass. Remove all cushions and pillows to check the benches and areas over wheel wells, as water leaks develop in these regions.