Jason, IIRC this problem has been ongoing since April or May plus you're out the money for the local dealer to come out and replace 1-4 1/4" long brass shear pins that I used to pay a Rainsoft dealer something like $1.98 each for, and whatever else the tech replaced or did. Now the softener has failed again and you are questioning IF the tech did or didn't do something that caused the salty water problem so you're looking into replacing the control valve.
In a previous thread of yours, you say you didn't have time to be a DIY yet since then I'd guess you've spent much more time than it will take to replace the control valve or install a new softener. Here's a link to that
thread.
I suggest a Clack WS-1 control valve over the Fleck valves. It will be less to purchase and much quicker and easier to repair when needed; plus parts cost less. It has variable reserve, it uses soft water for brine makeup with either Pre or Post brining, calendar override and NOVRAM memory to maintain programming data (for many years) without the need for a battery. It also keeps time during a power failure for up to two hours. The version of circuit board I suggest allows full control of the length of time of each cycle position of a regeneration. It also stores extensive water usage and other history, the number of regenerations and when they have happened and daily water usage patterns over the past 63 days etc., the maximum gpm ever run through the softener or filter and other troubleshooting data. It's head and shoulders above the majority of Fleck controls but especially the 5600 and 2510 in any of their versions. You can contact me privately for more info.
Also, I include very detailed instructions for replacing a control valve, programming it, getting the softener or filter back into service in the proper way so as to not cause serious problems later and toll free telephone support while you're doing it or for any questions or problems at anytime later.