As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OBSERVED EVIDENCE OF FUEL LEAK ON CLIMB OUT, PERFORMED QRH TO VERIFY LEAK ON #1 ENGINE. GROUNDED - YES. AIR TURNBACK - OPENED #1 ENGINE COWL FOUND FUEL LEAK IN LINE ABOVE HMU REQUIRES LINE REPLACED. CLEANED AREA SECURED COWL CLOSED REF AMM 71-11-02. REPLACED #1 ENG HMU FUEL TUBE REF AMM 73-21-10-000-801-F00. & AMM 73-21-10-400-801-F00. GROUND VERIFICATION CHECKS GOOD. NO LEAKS NOTED.