What was found
FLT 6202 - MHT-IAD - DURING TAXI, EXPERIENCED A DISCREPANCY WITH THE RT MAIN LANDING GEAR PRIMARY INDICATOR NOT ILLUMINATING. MAINTENANCE CONTROL NOTIFIED AND AIRCRAFT RETURNED TO THE GATE. MAINTENANCE WAS DISPATCHED AND FOUND THAT THE LIGHT BULB HAD BURNED OUT. MAINTENANCE REPLACED THE BULB AND TESTED THE SYSTEM. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (M)