"MTTFPS" I love new acronyms. That being said the scenario was old machine(from ebay,craigslist or maybe Freedonia) had solenoid failure. A spare on the shelf, unfortunately the spare was 24ac and the supply was 24vdc.
Upon further investigation 2 other solenoids on machine junk.. New solenoids...
Here is a link (page 20+):
http://literature.rockwellautomation.com/idc/groups/literature/documents/qs/iasimp-qs027_-en-p.pdf
Right click on AENT and select module.