What was found
FATIGUE CRACK FOUND ON FOWARD LOWER CORNER OF DOOR FOUR RIGHT. CRACKING IS SIMILAR TO THAT REFERENCED IN SERVICE BULLETIN 747-52-2168. THERE WAS NO COLLISION OR CORROSION DAMAGE. HOWEVER, AN OLD SHEETMETAL REPAIR ON THE BEAM MAY HAVE CREATED A STRESS CONCENTRATION. REPLACED LOWER BEAM PART NUMBER (65B04406-610) AND REPAIRED CRACK ALONG VERTICAL FRAME PER SRM 52-10-00 AND 51-40-03.