I am currently researching on this issue. As soon as I can, I will send you a message with my findings. Thank you for your patience and understanding.
Somehow, someone at some point set the PJ input signal type from 'Auto' to Component. Of course it should be RGB. Setting it back to Auto last night solved the problem.
I'm embarrassed that I didn't check that first instead of two days of EDID research. So sorry for the fire drill.