Have you been able to review the samples I mentioned, specifically checking a folder for stopped services?
for item in dataObj['services']:
fullSvcName = item['serviceName'] + "." + item['type']
statusURL = "/arcgis/admin/services/" + folder + fullSvcName + "/status"
The section above is where it will loop through every service, construct the URL to the service, and check the status. You'll want to modify that to grab the JSON of the service, loop through the key:value pairs to find the keys you need, and return them by printing them or writing them to a file.