What was found
RED B LANDING GEAR LIGHTS WOULD NOT EXTINGUISH WHEN LANDING GEAR HANDLE RAISED IN UP POSTION (CYCLED GEAR TWICE). RETURNED TO PDX. REPLACED LANDING GEAR CONTROL BOX, OPS CHECK GOOD IAW MM CH 22. (P/N 12038544501), (S/N 120009R) ON, (S/N 120085) OFF.