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I see a similar checkered pattern on my 071 wihen there's dew/icing on the sensor. As Greg says, shine a torch on the sensor and you'll see it. And it's really obvious when you do the flats
Recharge the desiccant. Just takes 2min in microwave, and/or put in the extra desiccant in the side port. I seem to have do redo mine every few months. If I see it, pushing it back up to+5C then taking it back down to 0C also works.
Also, I only cool mine to 0 or -5C. More often just 0 nowadays as it doesn't really need that much cooling.
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