AGR cooler and hose package costs

Hello, last week my moose with 48500 km got its annual inspection. One day later I had the moto control light with the “Check” symbol in the tacho, so back to the dealer. Mistakes read out and and it came from the AGR cooler was told to me. Reset and another attempt. Again one day later the same game. So called and asked what the “Fun” would cost. It would have to be replaced the cooler with hose package. 60% have been guaranteed. Have you experienced similar things and have the parts improved or do I have to expect a replacement in km X again?