Becky, you're in a different market so your channels are different than mine. I'm not familiar with NBCSP, but could it be a Spanish language channel (NBCSPanish)? If it is a Spanish language channel, would English be the proper language when SAP is ON? But, that wouldn't explain no audio when SAP is OFF.
In my market, if whatever Fox Sports Southwest (27/1027) is broadcasting has a Spanish language broadcast (like baseball games), the audio will be in Spanish when SAP is OFF. To get English, SAP must be toggled ON. Please contact the video engineers and ask them to swap the SAP settings for this channel. I'm not aware of any other channels with Spanish audio when SAP is OFF, but there could be others that just didn't have a Spanish broadcast when I checked. I'm currently not aware of any channels with no audio, but things tend to change.