What was found
AFTER TAKEOFF ON GEAR RETRACTION, GEAR UNSAFE LIGHT REMAINED ILLUMINATED. RECYCLED GEAR, NO CHANGE. COMPLIED WITH GEAR UNSAFE PROCEDURES. THE LANDING AT SJC WAS UNEVENTFUL. PERFORMED PROXIMITY CONTROL BOX TEST. PERFORMED ADJUST/TEST IAW DC8 MM 32-60-0. COULD NOT REPEAT DISCREPANCY. OPS CHECKED GOOD.