What was found
"DURING TAXI WHILE STARTING LH ENGINE L START CUTOUT EICAS AFTER ENGINE START SEQUENCE WAS NORMAL WITH START SWITCH, SWITCHING TO AUTO POSITION AT 50% N2 AC RETURNED TO GATE AND MTX GROUNDED AC .AND DEFERRED LH START CUTOUT IAW MEL ABX-80-00-2-1 . AND RETURNED AC TO SERVICE . AND DEPARTED . NEXT LEG REPLACED L START VALVE REF: L/P 38632-27/2 AND AMM 80-11-02. OPS TEST OK. THIS CLEARS DI 53104. PLACARD REMOVED. A/C VERIFIED ETOPS 180. REF LP 38632-28/1"