Kenny: If you need a visual leak detection method...you can use the same dye that AC technicians use...the fluorescent leak dye. Use the AC propellant to place the dye into an empty bag, fill bag with air to pressure...then a black light to hunt the leak...or just look for it since it will drip dye out of every leaky area. If there is too much dye in a single area...WIPE....refill air bag and observe.
I went more simple...I replaced the old leaking bags....did not add the OLD hoses to the new bags and replaced the hoses with a combo of steel (brake line) and hydraulic line (flex). Fittings are highly available. Now I have a non leaking system and no hunt a leak headache. But the common fluorescent dye will do a great job of showing you the leak areas. Used to play the role of leak detection specialist in another life.
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)