What was found
INSPECTION TYPE: N/A SUPPLEMENTAL SDR, ATB, NO EMERGENCY DECLARED AND NO EQUIPMENT USED. LEADING EDGE FLAP ASSYMETRY. QRH COMPLIED WITH DESTINATION WEATHER AT CAT II MINS AIR TURN BACK. FLAP ALE EXTENDED FL200 SPEED CLIMB 280, 240 KIAS. R & R SLAT NR 9 INBOARD SENSOR, IAW AMM 27-88-01-REV 131.01. IPC REF 27-88-01-01.