What was found
AIRCRAFT WAS NOT GROUNDED AND IS IN CHECK FOR SCHEDULED MX. DURING EO AC-72EO-33779 ON ENG 1 TRANSFER GEARBOX MODULE INTERNAL SURFACE FOUND WITH 2 SEPARATE CRACKS NEAR BEARING SUPPORT. CRACK "A" WITH A TOTAL LENGTH OF APPROX 4.31MM (0.170IN) CRACK "B" WITH A TOTAL LENGTH OF APPROX. 4.67MM (0.184IN) AS PER TASK CARD REPLACEMENT OF TGB REQUIRED I.A.W AMM 72-62-00-04 REV. 96 CORRECTIVE ACTION: REPLACED TGB AS PER AMM 72-62-03, REFER TO GE ON WING SUPPORT 8130 TRACKING NUMBER 9500169379-0001 MX ACTION IS ACCEPTABLE./END/