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As the CCD is not self-healing, that means that the streak would stay on the image, not pop in and out.
Radiation damage creates hot pixels in the STIS CCD Detector. Many of these hot pixels can be repaired by warming the CCD from its normal operating temperature near -83°C up to the ambient instrument temperature of about +5°C for several hours. Despite this annealing procedure, the number of permanently hot pixels has been increasing with time.