As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK #2 ENGINE START VALVE FAILED TO CLOSE AT 56% N2 QRH COMPLETED, ALERT EXTINGUISHED. GROUNDED - YES. REMOVED AND REPLACED #2 ENG START VALVE PER B737-800 AMM 80-11-03/401. LEAK CK GOOD PER AMM TASK 71-00-00-800-811-F00. GROUND VERIFICATION CKS GOOD.