I’ve been searching Google for this and it seems most users just send them to someone else for repair or buy the whole assembly. The P4 is not that complex, I just tore apart a Spark and was surprised how much DJI managed to stuff in there.
I broke, on my P4 ADV, a grey Mini PCI UFL (2) cable from 3in1 board to landing leg. I really don’t want to buy a whole landing setup with the cables. It’s frustrating because the only thing I can find is Mini PCI UFL to SMA adapter