The boards are quickly becoming unavailable. I believe they are all listed as repair only by Otis Service Center. The OVF30 can be retrofitted to a new Magnetek drive in some jurisdictions but not all. You would need to check with your local Otis office. For repairs you have OSC(Unitec), Access Electronics in Maryland and a few other that have been mentioned already.
Overall the 411-MMS is solid controller but unfortunately with boards becoming obsolete it will be time to start considering a modernization.
