So you cold crashed in corny #1 then transferred to corny #2 for serving?
Did you ferment in corny #1 or just put it there to cold crash?
What did you do to prevent all the stuff that settled out from fermentation/cold crash from getting picked up and transferred to the serving keg?
And what do you mean by bubbling/boiling? Like when Corny #1 was empty you pushed CO2 from corny #1 into corny #2 and it just bubbled through the beer?
Provided you didn't ferment in #1 and push trub/yeast into #2 you can just let it sit for a couple days then dump the first cloudy pint, after that it'll probably clear up. Cold crashing doesn't drop out enough material to where you need to transfer it into a serving keg, just serve from the one it's in. The only time I'll push beer to another keg is if I want to free up a specific keg (i have different sizes) or if I need to take a full keg somewhere since that'll stir up the sediment (unless it's a hefe). Once it's pouring clear beer it'll transfer clean but yea, if you empty the beer the next thing to come out is all the stuff on the bottom of the keg which puts you back at the beginning.