AV-278M5 color distortion problem

Hi Ms. Sample; My television is 12 years old and is exhibiting persistent color distortion consistant with exposure to strong magnetic fields. (No doubt from the large, flanking, JBL speakers I was blasting this morning. AC/DC seeks its own level, yes?) Anyway, does this model have a degaussing command? The distortion looks like a broad, bullseye pattern with concentric bands of primary colors. Thanks for your help.

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