As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLIGHT 2507 - DURING ENGINE START AFTER PUSHBACK RECEIVED A LEFT ENGINE STARTER VALVE CAUTION. RETURNED TO THE GATE. MAINTENANCE PLACED THE SYSTEM ON MEL 80-11-3. AIRCRAFT RETURNED TO SERVICE. REPLACED THE STARTER CONTROL VALVE. OPERATIONAL CHECKS GOOD MEL CLOSED. AIRCRAFT RETURNED TO SERVICE.