When I do CAS4 soldering, I gently scrape away the coating on the board above my solder points, put a small dot of flux on each point, and tin each point with leaded solder. That way I have a nice shiny solder dot to tack my wires to. The clock wires can be tricky, especially with the ceramic crystal. If you gently remove the coating and use some flux, you'll get those wires attached.
I strongly suggest cloning with hextag and NOT attempting any OBD process, much safer process.
Is there a hardware problem that justifies replacing the CAS4, or did somebody corrupt it trying to make a key? If data is damaged, it will take a little more work.