first clean all board with soft brush to remove all dust. then by knife clean tracks varnish. then solder wires. then cover it by new varhinsh (like green varhish, which need ultraviolet lamps to be frozen up). alcohol is any nice, just need clean alcohol. not a whiskey...
and clean that place jp1, 2, 3, 4 to see what happen thear and make photo. clear and zoom.