What was found
NR 4 LEADING EDGE FLAP WOULD NOT RETRACT WHEN WE MOVED FROM FLAP 5 TO 2 WHILE INFLIGHT. INSTALLED JUMPER CABLE ON NR 4 L/E FLAP. UPON INSP FOUND NR 4 LE FLAP LIGHT ON AT S/O'S. PANEL WHEN NR 4 LE FLAP FULLY RETRACTED. INSTALLED ADAPTER CABLE ON NR 4 LE FLAP INDICATION SWITCH IAW MM CH 27-82-000-1. ALL LEADING EDGE FLAP AND SLATS OPS CK NORM IAW MM 27-81-000-0. REMOVED ADAPTER CABLE FROM NR 4 LEADING EDGE FLAP SWITCH, CLEANED ALL CONNECTIONS, PREFORMED OPS CHECK OF FLAP/SLAT SYSTEM IAW M.M. 27-82-001-4. ALL INDICATIONS NORMAL.