What was found
(CAN) NOTED A 2 5/16 INCH CRACK IN LOWER LEFT FUSELAGE SKIN P/N 129-400031-51 DURING A SCHEDULED MAINTENANCE EVENT. THE CRACK IS LOCATED AT FS 303.25 WHICH IS A BULKHEAD JUST FORWARD OF THE 4TH LEFT CABIN WINDOW. THE CRACK EXTENDED FROM A RIVET HOLE AT THE BULKHEAD TO THE WINDOW CUTOUT. THERE IS A PREVIOUS REPAIR APPROXIMATELY 6 INCHES BELOW THIS CRACK. THE CRACK APPEARS TO HAVE ORIGINATED FROM THE WINDOW CUTOUT AND PROGRESSED FORWARD. THE PREVIOUS REPAIR IN THIS AREA HAS THE DAMAGE CLEANED OUT FROM THE WINDOW CUTOUT AREA AS WELL. THE CRACKED SKIN WAS REPAIRED AND INCORPORATED THE PREVIOUS REPAIR INTO ONE REPAIR.