What was found
AFTER TAKEOFF RIGHT GEAR STAYED ILLUMINATED RED WHEN GEAR WAS RETRACTED. PER QRH RECYCLED GEAR AND CONSEQUENTLY RECEIVED RED AND GREEN ANNUNCIATION. FUEL DUMP AND RETURN TO AIRFIELD INITIATED. DURING FUEL DUMP RIGHT MAIN ALTERNATED BETWEEN RED AND RED/GREEN. UNEVENTFUL LANDING OF 1.18 G S. EMERGENCY DECLARED. REMOVED AND REPLACED THE CRANK ASSY &CHECKED CLEARANCE BETWEEN THE PROXIMITY SENSOR & TARGET, 0.018. ADJUSTED CLEARANCE TO 0.176 IAW AMM 32-34-03-4, 32-61-15-4 & EA 1-3230-T0373284 P1. PERFORMED MLG UP & DOOR LATCHED PROX SENSOR RETURN TO SERVICE TEST, NO DEFECTS IAW AMM 32-61-15-5.