What was found
LEADING EDGE FLAPS TRANSIT LIGHT ILLUMINATED AT CRUISE AT FL 370. THE #8 SLAT INDICATED GREEN IN EXT POSITION. RAN QRH AND AFTER CYCLING FLAPS TO POSITION 1 AND THEN UP THE LE FLAPS TRANSIT LIGHT WENT OUT BUT THEN REILLUMINATED. LANDED FLAPS 15 PER QRH AND BRAKE COOLING A NON-ISSUE. TROUBLESHOOT PER FIM 27-88 TASK 803<[01] OK TO CONTINUE PER MEL 27-4-06; SP1/ SP2<BR>MDDR# 250112;[02] R/R #8 OB LE PROX SENSOR PER AMM 27-88-11. OPS CHECK GOOD. MEL CLEARED.