As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI AFTER #2 ENGINE START, ENGINE STABILIZED, SPAR VALVE DISCRETE LIGHT ILLUMINATED, #2 ENGINE SHUT DOWN.AND AC RETURNED TO GATE .MAINTENANCE GROUNDED AC AND FOUND PART OF OLD CLAMP JAMMING VALVE ARM. REMOVED FOD AND OPS CK GOOD IAW AMM 28-22-11.AC WAS RETURNED TO SERVICE AND DEPARTED.