What was found
DURING A IMBV INSPECTION, THE SERVICE DOOR CENTER SILL WAS FOUND CORRODED. REMOVED THE DAMAGED SILL AND CLEANED THE AREA. POSITION THE NEW SILL AND DRILLED, REMOVED TO CLEAN AND TREAT NEW PART. REPAIR DONE IAW SRM 51-20-01, 51-20-03, 51-40-02, 51-40-04 AND 51-40-06. AIRCRAFT RETURNED TO SERVICE.