As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EVIDENCE OF FLUID LEAK PUDDLED ABOVE THE HYDROMECHANICAL UNIT ON THE #1 ENGINE. GROUNDED - YES. GROUND IDLE RAN #1 ENGINE REF B737-800 AMM 71-00-00-700-801-F00. FOUND TUBE THAT CONNECTS FROM THE FUEL HEATER OUTLET PORT TO THE HMU LEAKING (POSSIBLE CRACK IN THE TUBE.) REMOVED AND REPLACED FUEL TUBE PER AMM 73-11-07 SUBTASK 73-11-07-020-007-F00. LEAK CHECK GOOD PER AMM 71-00-00-700-801-F00.