As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI - RETURN TO BLOCK - FLT 451 - "C" - AFTER PUSH BACK FROM GATE WITH NR 1 ENGINE STARTED, ATTEMPTED TO START NR 2 ENGINE WHEN NR 1 ENGINE SHUTDOWN, AIRCRAFT WAS PUSHED BACK TO GATE. MAINTENANCE TROUBLESHOT AND FOUND MOISTURE IN THE NR 1 ENGINE FUEL SHUT OFF VALVE ACTUATOR CANNON PLUG. THE CANNON PLUG WAS CLEANED AND RECONNECTED IAW BMM 28-22-11, AND THE FUEL TANK WAS CHECKED FOR WATER (NO WATER FOUND). ENGINES NR 1 AND NR 2 OPERATIONAL CHECKED GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.