Accessing Zephyr Test Step field values using groovy.

[Artemy Matvienko]

I need to access the "Zephyr Test Step" field data on a JIRA "Test" issue type using a groovy script. I can't seem to accomplish that with a script that works for other custom fields:

import com.atlassian.jira.component.ComponentAccessor

import org.apache.log4j.Logger
import org.apache.log4j.Level
def log = Logger.getLogger("com.acme.CreateSubtask")
log.setLevel(Level.DEBUG)

def customFieldManager = ComponentAccessor.getCustomFieldManager() 
def issue = ComponentAccessor.getIssueManager().getIssueObject('PROJ-58')
def fields = customFieldManager.getCustomFieldObjects(issue)
log.info(fields)
def cf = fields.find {it.name == 'Zephyr Teststep'}
log.info(cf.getValue(issue))

Is there a way to accomplish this? 

I'm also curious if the "Clones an issue, and links" ScriptRunner workflow transition script has a way to successfully clone the zephyr field, or if I have to put in custom code to map the field.

[hellboy]

Is there possible to change or access  Zephyr Teststep custom field value directly without using ZAPI?