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First of all do you know if your duct work is the insulated flexible type or galvanized, if it's the latter type then a mouse did not chew through it.
Many times condensation occurs on the outside of ducting as the temperature on the outside of the duct is significantly different than the inside of the duct. My HVAC guys always make sure any duct work running anywhere in ceilings gets wrapped in insulation before the ceiling is installed, this most times circumvents this condensation problem in the future.
Unfortunately I don't think there is an easy fix in your situation, first you need to ascertain what kind of ducting is running through your ceiling where the "bubbling" is, Sometimes the fix could be as easy as removing a small section of ceiling and applying duct sealing tape to a join in the galvanized ducts or the same if it's a flex duct with a "miami mice" hole.
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