NTSB Rips FAA For Delayed 737 Rudder Response

According to the NTSB’s recent press release, the problem was identified by the end of February by cold-soak testing at Collins in Iowa, with NTSB participation.
Boeing should have issued an MOM at that time.
NTSB was slow to issue a preliminary report.

CORRECTION:
There was a preliminary report from NTSB, not dated in website version but apparently issued in March-April time.