Problem solved!
Nut on top of shock was loose allowing crown/cup to move around.
Tightened nut, cleaned actuator and electrical connectors with electrical contact cleaner and put back together. Cleared codes and went for a test drive. No codes returned and shocks appeared to respond to switch position.
Always use the KISS method before you buy "not needed" parts...
Many thanks to those who responded by PM and posts with parts availability and suggestions!
