As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HAND ENGINE REAR ENGINE MOUNT HANGAR FITTING HAS PITTING CORROSION IN CONE BOLT MATING SURFACE. REPLACED #1 ENGINE REAR MOUNT HANGAR FITTING IAW B737-400 AMM 71-21-03 REV 90. SEE NDT REPORT NDT19-5645 FOR HANGAR BOLT INSPECTION. NO CRACKS FOUND. NEEDS PART INFO, STILL OPEN