I'm a propane tech here on my island, and we use soapy water in a spray bottle to detect any gas leaks in the plumbing. Low pressures are a few inches of water here, so this is a very sensitive leak-detector and localizer. Peter
You could alternatively pressurize the tank with nitrogen and then use a refrigerant sniffer to go over all the seams. It will find the smallest of leaks quickly and easily.
