Pressure not distributed equally

[c59]

Hi.
I have a Double Gauge Regulator hooked up to a 3-Way Air Distributor. Each line from the the 3-Way AD goes to a single 1/6 barrel. Pressure is perfect on line 1 and almost perfect on line 2. Line 3 drops significantly; very weak. This worked very well in the past, but started to decline recently. I've checked for leaks and found none. Any suggestions?
Thanks!

[PremiumVADraftTech]

Kegerator?

Do you have all 3 backflows in each coupler?

[djc]

Assuming you have the check valves (duckbills) in place, have you inspected them? A sticky valve will prevent good flow. There is nothing other than a mechanical issue that should prevent even distribution of pressure.