Relocate the service.

$ srvctl status service -d RPTs
Service RPTS1 is running on instance(s) RPTS2
Service RPTS2 is running on instance(s) RPTS2
Service RPTS3 is running on instance(s) RPTS2
Service RPTS0 is running on instance(s) RPTS3, RPTS2
$ srvctl relocate service -h
Usage: srvctl relocate service -d <name> -s <service_name> -i <old_inst_name> -t <new_inst_name> [-f]
   -d <name>           Unique name for the database
   -s <service>        Service name
   -i <old_inst>       Old instance name
   -t <new_inst>       New instance name
   -f                  Disconnect all sessions during stop or relocate service operations
   -h                  Print usage
$ srvctl relocate service -d RPTS -s RPTS3 -i RPTS2 -t RPTS3
$ srvctl status service -d RPTS
Service RPTS1 is running on instance(s) RPTS2
Service RPTS2 is running on instance(s) RPTS2
Service RPTS3 is running on instance(s) RPTS3
Service RPTS0 is running on instance(s) RPTS3, RPTS2