What was found
#4 SLAT SKIN CRACKED AT ACTUATOR ATTACH POINT. #4 SLAT SKIN CRACK END POINT MEASURED VISUALLY APPROXIMATELY 1/4". #4 SLAT HAS BEEN REMOVED. RII ACCOMPLISHED ON INTERFACE INSPECTION. OK TO INSTALL #4 SLAT. INSTALLED #4 SLAT. NOTE INBOARD PRELOAD ADJUST BOLT REQUIRES SAFTEY WIRE. LEFT OFF FOR RIGGING. N/R REMAINS OPEN FOR RIGGING. RII ACCOMPLISHED ON #4 SLAT INSTALLATION. COMPLETED FINAL INSTALLATION OF #4 SLAT. OK FOR SERVICE.