Use svcs -l service_fmri to determine the restarter for the service.

For services managed by svc:/system/svc/restarter:default, collect data for Sun Service. In particular, obtain a core file for svc.startd using gcore(1), as well as svcs -x output. Once data has been obtained, it may be possible to restore service operation clearing the maintenance state with svcadm(1M).

For services managed by other restarters, no diagnosis may be available by design. See the documentation for the relevant restarter for guidance. Running svcadm clear service_fmri will request that the restarter clear the maintenance state.

When a restarter places a service in the maintenance state, it may supply an explanation. The Message ID:   SMF-8000-9C indicates that the restarter for the service did not supply an explanation. If svc:/system/svc/restarter:default is the restarter, this condition generally indicates a defect in Solaris.

See "Predictive Self-Healing" for additional information, also placing "svc.startd in debug mode" will provide more information in the /var/svc/log/svc.startd.log file.