In early April 2019, Boeing reported a problem with software affecting flaps and other flight-control hardware, unrelated to MCAS; classified as critical to flight safety, the FAA has ordered Boeing to fix the problem correspondingly.[129] In October 2019, the EASA has suggested to conduct more testing on proposed revisions to flight-control computers due to its concerns about portions of proposed fixes to MCAS.[130] The necessary changes to improve redundancy between the two flight control computers have proved more complex and time-consuming than the fixes for the original MCAS issue, delaying any re-introduction to service beyond the date originally envisaged.[3]