Here is a link to my one drive folder, it has 5 10 min dark files so you can see there are no bad columns. The exif data will also confirm the cooler is functioning correctly.
https://1drv.ms/f/s!AnY6mHJvrVO05nGTw-NWtySXbDUk
Attached are images of every side of camera so you can assess the cosmetic condition.