What was found
AIRCRAFT GROUNDED FOR HEAVY MAINTENANCE. NR 1 SLAT AFT SIDE COVE STRUCTURE HAS 2 CRACKS, LOCATED ABOVE THE INBOARD MAIN TRACK FITTING. ONE CRACK IS ABOUT 2 1/4" AND THE OTHER IS ABOUT 1 3/8" IN LENGTH, AT APPROXIMATELY OUTBOARD SLAT STATION 737. REMOVED AND REPLACED NR 1 SLAT COVER PANEL P/N 114N4075-19 IN ACCORDANCE WITH DRAWING 114N4075 AND SRM 51-40-02 PARAGRAPH 4, 5, 7, 9.