Aircraft was EI-CRK EI109 (SNN-DUB-JFK). It arrived from SNN as normal then endured a 3 hr delay before the flight was finally cancelled. I asked a passenger what they were told the problem was and he said they were having trouble with a door seal on the aircraft so I guess that plays into the whole cabin pressurisation problem. Passengers were accommodated overnight and EI hired in an Air Pallamantur 742 the next day to complete the 109/108 rotation.