Rumors have been going around for a while already on Undernet about the introduction of a Chanfix service introduction. A bot with the nick chanfix was online, but with a realname “Chanfix is not yet available on Undernet.”
Yesterday, Undernet officially announced the new service with a network wide notice inviting users to join #Class and learn about the new service:
-LiveEvent- The UnderNet User Committee will be presenting a LiveEvent concerning ChanFix for users of the UnderNet and IRC. To attend, please type /join #Class now. Thanks, and please do not reply 
Chanfix is a service originated on the EFnet network, and is coded to help users maintain their ops on channels. EFnet traditionally never offered channel services, such as X on Undernet. On Undernet however, it is quite hard for users to get X on their channel because of the strict requirements. Especially for the smaller channels it is hard to get registered.
Chanfix, as it is implemented on Undernet, will automatically reop channels (with a minimum of 4 users) as they become opless. It will constantly gather data regarding who is opped, and will automatically reop the users with the highest score. Scores are kept together with the username the user is logged in with, not with the hostmask of the user. So at least one, but preferably a few users of a channel needs to be logged in to X for this service to work for that channel.
Update: The Undernet User Committee who organised the event have released the logfile for reference here.