I think you are into removing the complete control valve and disassembling the sections to inspect the load check valves and the springs. Don't assume that because your problem was with the spring jammed in the spool that controls the stick that's where it came from, although I would definitely look there first. Whichever sections of the control valve that you pull apart you will have to replace the O-Rings #10, 11, & 14 on each section. When you find where the spring came from you might well have to replace the check valve #13 in addition to installing a new spring.