What was found
ORD - ABORTED START ON LEFT ENGINE MAX, EGT 500 DEGREE TEMP RISE WAS VERY RAPID BEFORE ABORT, MAX N2 BEFORE FUEL WAS PLACED ON 20 PERCENT PNEUMATIC PRESS -40 PSI NORMAL FUEL FLOW. REMOVED AND REPLACED LEFT ENGINE STARTER AND START VALVE, ENGINE RUN CHECKS GOOD WITH NORMAL PARAMETERS IAW MM 80-00-00. (M)