jabillsShops will not test those bindings since they are no longer on the approved list so unless you have the necessary testing equipment you wont be able to tell if they are releasing properly. I would not ride those. Its better to go and get yourself some new bindings rather than use those and end up injured.
FKJ Pro is actually still on the list... probably shouldn't be, but a shop is allowed to work on them if they wish
And yeah I have seen it, what I would do is crank the dins full, with the binding in the relaxed position(dildos down), then try popping the yellow cover back on, on any FKS/FKX/FKJ that isn't pinned, if you back the din off(lower) it will eventually start to pull the cover away from the main assembly. PM me if any of this is unclear and maybe I can make you a video or send some pics