Hello,
if it helps to find an LNB, I'm using a Megasat Diavolo Twin, which is still available from: https://www.reichelt.de/lnb-tw…volo-twin-p74259.html?r=1
73 de Achim
Maybe you could give some more information?
Is the LNB wobbling?
What PLL/Mixer IC?
Xtal freq?
Pictures from the PCB?
vy73