As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSEPCTION OF NEW FCU PART BEFORE INSTALLING ON AIRCRAFT REVEALED A SUBSURFACE FLAW RUNNING LONGITUDINALLY DOWN THE FEMALE SPLINE. THIS UNIT IS A PLASTIC DRIVE COUPLING BETWEEN THE ENGINE DRIVEN FUEL PUMP AND THE FUEL CONTROL. FAILURE WOULD HAVE CAUSED AN ENGINE FLAME OUT. SUBMITTER STATED DEFECT IS IN MANUFACTURE.