What was found
AFTER PUSH BACK, AFTER CONTROL SWITCH TO RUN N2 DECREASED TO 23 PERCENT, ESS, & CAS RAMP CONTROL REPORTED FIRE/SPARKS COMING FROM LT ENGINE. FUEL CONTROL SWITCH MOVED TO CUTOFF, ATTEMPED TO MOTOR ENGINE. LEFT ENGINE START SWITCH TO OFF. WILL NOT MOTOR. R & R LEFT ENG STARTER IAW REF 80-11-01-404-014N00 & START VALVE TASK CARD 80-11-02-404-02-N00, SERVICED ENG NR 1 STARTER IAW T/C 12-22-02-603. PERFORMED TEST OF THE ENG VALVE MOTORED, ENG LEAK CHECK SYS IAW 80-11-00/501. OPS CHECK NORMAL. WORK ACCOMPLISHED BY CONTRACTOR: CAS.