According to an AFP (news agency) report today:
GE recommended the repairs last month, the FAA statement Friday said, and Boeing and GE have been working on the issue for months, with more than 40 Dreamliner engines fixed so far, reports say.
The repairs -- involving grinding down engine casings -- can be done without removing the engines from planes.
The FAA order also requires that pilots be alerted to new operating procedures for coping with possible icing problems at low altitude.