What was found
DURING TAXI AFTER RIGHT ENGINE START, RIGHT ENGINE FUEL VALVE LIGHT AND "R ENG FUEL VAL" EICAS MESSAGE ILLUMINATED AC RETURNED TO GATE AND MAINTENANCE GROUNDED AC . MAINTENANCE DEFERRED ENGINE VALVE INDICATION IAW MEL ABX-73-21-3-1. RETURNED AC TO SERVICE AND DEPARTED.LIGHT + EICAS OPS NORMAL BEFORE TROUBLESHOOTING. REPLACED RELAY K169. VERIFIED BOTH IGNITIONS + FUEL DELIVERY, REF B767 AMM 76-11-00 ALL LIGHTS + EICAS INDICATIONS NORMAL. THIS CLEARS DI 48905. PLACARD REMOVED. NO REACTIVATION PROCEDURES REQUIRED. AIRCRAFT REMAINS "ETOPS 180".