ErnsTT, welcome to RetouchPRO

Good luck and enjoy your time here. I hope you find an amiable solution to your problem!
You may want to look at this thread:
"any-hope-moire"
which is based on
this tutorial
I took a different route,
added a 1/2" black border on each side
ran a FFT action (below)
channel mixer layer, mono checked, green100% set to luminosity
then used Imagenomic Noiseware at the default Full(weak noise) setting to remove some more noise