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You may want to see if there's any moisture build up or discoloration around the CCD's sensors pins. This sometimes occurs, and needs to be cleaned properly. Which may explain why at high cooling temps, the problems gone, but at lower, it occurs.
Just use a old toothbrush, and some isopropanol to clean the pins around the CCD. Be careful there's no temp sensor, or other delicate wires around the sensor.
Use a hair dryer, or portable heater to dry out the chamber before sealing it again.
Theo.
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