I know your pain.
I have experienced several problems w/ CO2 and my Danby. I think they just use really crappy parts. Utilize their customer service. The item is still under warranty for me. They literally have replaced every item except the refrigerator on the unit (tower, beer line, CO2 line, coupler, gas line, regulator, and tank). Pretty amazing. They actually replaced the coupler 2 times for me.
I think I finally have it down. But my point is, searching for a CO2 leak can be frustrating to say the least, especially if the leak is so small it won't show up using the soapy water.
There is a CO2 leak test method posted elsewhere on this forum utilizing the readout high pressure gauge that will help you isolate the general area of the leak (i.e. regulator, gas line, or coupler). Scott could point you to the actual post. That won't actually fix it, you will probably need new parts anyway. The cost of those parts is what you want to keep down so it may be worth it for you to search. It would suck to buy a new regulator when you didn't actually need one.
Some common sources of the CO2 leak stem from a faulty regulator, missing check valve in gas line to coupler connection, missing washer from coupler to beer line connection, or your lines are not secured tightly. The coupler can also cause a leak if it is not making a good connection to the keg (check the seals on bottom of the coupler for damage).
I went through all of these items. Actually I am still not convinced it is fixed, but the CO2 seems to be going at a normal rate (2.5 kegs, 5# CO2 tank still weighs 12.5 lb from a 7.5 tare weight). My next step is to put a stick of dynamite inside the thing, or alternatively, get my money back.
Good luck. Hope this helps.
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