As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INJECTOR ARRIVED WITH NO FUEL FLOW. UPON PUTTING IT ON FLOW BENCH USING NORMAL FLOW PROCEDURES, WAS UNABLE TO GET FUEL FLOW. REMOVED HEX BRASS NUT FROM REGULATOR. THE RETAINING AND FLOW ADJUSTING NUT WAS MISSING. RECOMMEND ALL FLOW BENCH OPERATORS SHOULD BE CAUTIONED ABOUT C/W SB RS-71, LOCTITE THE ADJUSTING NUT.