As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT. ENG. IGNITION START SELECTOR DOES NOT HOLD IN THE GND POSITION WHEN STARTING. NO VALVE LIGHT, NO N2 ROTATION. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MINTENANCE. MAINTENANCE FOUND START CONTROL VALVE WAS FAULTY. START CONTROL VALVE WAS DEFERRED IAW ABX MEL 80-00-2-1. A MANUAL START WAS ACCOMPLISHED AND THE AIRCRAFT WAS RETURNED TO SERVICE.