As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INITIAL POWER UP FOR TAXI, RIGHT ENGINE MADE A LARGE THUMP AND SHUT ITSELF DOWN. REMOVED UPPER, LOWER BLEED AIR VALVES & ACCELERATION BLEED VALVE. INSTALLED NEW VALVES. OPS CKED GOOD. WORK DONE IAW ROLLS ROYCE AE3007C MM CH 75-31-10 & 75-31-15.