If you arent noticing the leak coming from the valve or around the valve you need to take the bladder out. The soapy water trick doesnt work so well on the outside when the leak is coming from the inside. The valve could be leaking between layers, the PRV on the inside is leaking or there is a hole in the bladder. All of these scenarios involve removing the valve and checking the bladder. Unscrew valve, unzip,remove. Reinstall valve in bladder, inflate, do soapy water trick. Repair the valve, bladder, PRV as needed and reseat the floor and valve.