There is nothing in Galileo's telemetry information that suggests improper CRM operation. During development, precautions were taken to eliminate CRM-spoke jamming. The CRM release was performed by firing redundant pyro events several times during the launch sequence. Launch telemetry indicated that the pyros fired properly, and that unlatch had occured as planned. The pyro CRM release commands were sent again from the ground after the antenna failed to open on the off chance that the launch telemetry was erroneous, and that both CDM pyros hadn't fired during launch.
Indications are that the pyros did fire properly at launch.
Slew the scan platform back and forth, banging it against the stops. Maybe that will help loosen the ribs. The resulting force transferred through to the ribs would be very small. A similar idea would be to rock the spin bearing assembly back and forth. Once again, there wouldn't be enough transfer of dynamic force to have any effect on the stuck ribs.