"The launch of the NOAA-N Prime weather satellite for NASA and NOAA aboard a United Launch Alliance Delta II rocket has been postponed for an additional 24 hours. A payload fairing air conditioning compressor at the launch pad has failed. This unit provides cool, dry air inside the fairing prior to launch."
Troubled NOAA-N Prime Ready For Launch, earlier post
NOAA-N-Prime Satellite Mishap Investigation Report Released, earlier post