one jack won't retract on HWH system

my 2012 Itasca Reyo has the HWH 725 series leveling system with spring retract jacks.  They all go down fine but the rt rear will not retract, even with new springs installed.  I have the white cam levers that flip on the solenoids to manually retract but even then it wont retract and I have to use a floor jack under it to move it back up.  Not sure which solenoid controls the rt rear. Already lubed the ram with Teflon spray too to no avail.  Thinking solenoid is bad but not sure which one it is or how to test it (I think the inner two are for front jacks?) Any advice?