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Digital Tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
Can also call the Tv station and have a informational conversation with the Engineering Department.
Do Not send text.
Do Not send E-mail.
Do Not go to social jibber jabber web sites.
Call the Tv station with a phone and have a real voice conversation.
http://en.wikipedia.org/wiki/KATU