Hi, Robert!
The colored tiny pixels aren't likely dead, their resting energy rate is just higher than their neighbors. They otherwise still function. The number looks about right to me. While a brand new camera usually shows fewer, more develop as the unit ages.
The location of such active pixels will change slowly over time. Up-to-date dark calibration frames almost exactly null these out, lowering their amplitide to match neighboring pixels in an image. Using a camera that has a cooler will reduce the strength of these pixels significantly, as well as lower the sensor's overall noise.
The lighter "lifesaver" circles are almost surely dust particles on the protective front glass of your camera...easily cleaned off with a lens brush or lens-cleaning kit (I can endorse the Pentax dust pen).
https://www.bhphotovideo.com/c/product/618600-REG/Pentax_39357_O_ICK1_Image_Sensor_Cleaning.html?sts=piWhen I use the same dark frames for a few weeks, a dozen, or so, new hot pixels eventually appear and aren't nulled out in an image. Easily fixed—Shoot new dark frames and restack. Or, if it's just a few, rubber stamp them out in photoshop and make a note to update the darks next time 'round.
Here's my current dark frame. ZWO ASI2600, BIN1 at full gain and cooled to -15C. Despite being quieter, it shows similar activity. But, remember, I had to amplify the levels of this frame a thousand times to even be able to see the hot pixels. So the difference between them and their neighbors is actually pretty small...though they can become visible when image levels are really pushed. Dark frames applied to an actual image pretty much makes them invisible, however.
