I have 91 Jamboree. Try looking for a 6" panel located on hallway wall near the shower floor - that has two valves which control the hot/cold shower drains which drain near the passenger side rear tires. The other drain valves can be accessed by looking in the compartment under the kitchen dinette bench (same compartment where water pump and water heater are located). Follow the water lines which run under the kitchen sink - the valves are located about 5" in. There just pop up valves and you need to press down to close them.