OK, It's the Assets, they are causing the lines.
Dither gradients was turned on, Thanks. Unfortunately that could not recpair the lines.
I found the only way to completely eliminate the break up was to Gaussian blur straight away, however even this was not a great remedy.
I could also just darken the lines and they disappeared, but that seems, well, just not right.
Could not see anyway to convert the assets to original photo specs and if it was done automatically it didn't work.
Anybody know where I can get a whole bunch of new Skies presumably 16bit or high quality at least....😂
Do you all think that would be the best solution, I don't use them that often so it's very frustrating when they cause so much work.
I want to thank you all for giving me good advice and ideas, it's great when other people give your brain a shake up...😂😂