What was found
AT C CK; CABIN SERVICE DOOR HAS CRACK ON EXTERNAL SKIN ON UPPER HINGE AREA. STOP DRILLED CRACK PER B727 SRM 51-10-1, PERFORMED HFEC PER NDT M/M 51-00-00 PART 6 FIG 4, NO CRACK INDICATIONS NOTED, INSTALLED DOUBLER REPAIR PER B727 SRM 51-40-2. (SIZE OF REPAIR-3 INCH X 9 INCH) REF: N/R 3356.