My Reply:
Done.
Followed above instructions (battery removed for over 5 minutes).
Lens removed, both storage cards removed.
On power up, without a lens attached, fault still remains.
Looking through viewfinder shows very noisy blue.
Same test using A7RVI shows almost perfect black.
Lens re attached (Sony GM 35 1.4) and cards reinserted.
Now, in lounge room, ISO 500, f1.4, 1/30 sec exposure shows fault: 8 vertical, evenly spaced blue lines.
These lines continue to text on bottom of EVF (ie, Shutter speed etc)
Took photo of TV.
Image Playback on EVF shows same seemingly random blue lines.
Areas of image away from TV show blue noise.
When Playback this image on Rear LCD, image appears normal, (no blue).
Photo attached showing camera with battery, lens and cards removed.