I was able to find the diagnostic procedure. I verified the door switch was operating correctly by use of a magnet. I then put the refigerator in diagnostic mode and verified there were not error codes. I then put the refigerator in test mode FF, which forces the refigerator compressor and all the cooling fans to run. I was able to determing that the ice maker circulating fan was inoperative. This fan is located on top of the Auger module DA97-12540K. The ice maker module has to be carefully removed after putting the refrigerator in test mode Fd, which is Forced defrost. Then removing the auger module and replacing it with a new one, reinstalling the ice maker, normal ice production has resumed.