/run/66/log/0/current only concern logs of the boot or if a service which do not have an associated logger send output to stderr.
Normally, each service should have its own logger.
So, the place to find log can be found at /var/log/66/<service>/current or $HOME/.66/log/service for regular user service.
You can view any log of any service doing:
66-inservice <service>
this will show you all information of a service. You can see the log of the service and uniquely the log with
66-inservice -o logfile <service>
You can specify the number of line to see of the log by
66-inservice -o logfile -p 100 <service>
This command will show you the last 100 line of the log.