Frozen spritz line

[Roys Refreshments]

Hi gang,
I have a kegged cocktail that i'm running through a celli icebank, as well as a couple of beer lines. I've come into the bar after the weekend and I can't get anything out of my cocktail tap. Gas all good, got pressure, so I'm thinking the line is frozen? Beers are OK. Is there a good way to unfreeze? Guess I can turn off the icebank but they take ages to defrost

 

[golfandbrew]

Have you tried switching the cocktail line over to one of the beer lines to confirm its frozen. What temp is celli set at? Is the longer outer line the frozen one?