Eventually determined that temperature in ice maker compartment was well below freezing but above the temp that the ice maker would trigger properly (about 20 deg F.). Replaced both the blower motor and air damper in the refrigerator/ice compartment which resolved the issue.. After bench testing determined that the damper worked fine but the blower motor had burned out. Actual repair was quick, less than 10 minutes, but troubleshooting took months as info was very limited and disjointed. Took multiple chat sessions with Appliance Parts Pros and online research.