What was found
NUMBER 4 LE FLAP ON RIGHT SIDE DID NOT RETRACT AFTER TAKEOFF DURING FLAP/SLAT RETRACTION. RAN QRH. EXTENDED NORMALLY AND DID NOT RETRACT SECOND TIME. FOUND LOOSE LINKAGE ON NR 4 LE FLAP SWITCH. SECURED LINKAGE, OPERATED FLAPS AND OPS CHECKED GOOD IAW MM 27-82-000-1. ACFT OK FOR FLIGHT. SWITCH REF. IPC ITEM 085, PART NUMBER 10-60819-18, IPC REF 27-80-00-14. LOOSE LINKAGE TO SWITCH FOUND, SECURED IAW AMM 27-82-000-1, OPS CHECK GOOD.