As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE VALVE LIGHT ILLUMINATED DURING START SEQUENCE,ON TAXI OUT NO N2 ROTATION.AC RETURNED TO GATE AC MAINTENACE GROUNDED AC AND DEFERRED RIGHT HAND START VALVE IAW MEL-ABX-80-00-2-1, RETURNED AC TO SERVICE AND MANUALLY STARTED ENGINE FOR DEPARTURE.