I bought a three tap Keggerator setup on line (Beverage Elements) sometime ago, price was Great! Everything was assembled, a quote tap and go system! I filled my kegs, force carbonated and allowed the kegs to sit for a few days.
Thirsty Tapping Time finally arrived and much to my suprise, no carbonation. Not even a spit.

? Bottle had completely emptied in 3 days. All those nicely taped connections became suspect. I made a picture of soapy water, dug out the turkey baster and yes, refilled my CO2 tank. Bubbles coming from several connections and one Corney lid seal. While re-tapeing ALL the connections, I also discovered the check valves in 2 of the diverter valves had Teflon Tape in them preventing them from working. nice!
It's now been several weeks, no leaks. I've dispensed almost three kegs, pressure is holding steady! All from the second 5lb co2 bottle!