As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L ENG BLEED DOES NOT CLOSE ON ENGINE SHUTDOWN. CAUSES A LOUD NOISE WITH AIR RUSHING FROM APU BLEED. PERFORMED L ENGINE IDLE RUN PER AMM 71-00-00 L ENG BLEED VALVE OPERATED NORMALLY. AFTER ENGINE SHUTDOWN NO LEAKS NOTED WITH APU BLEED AIR IAW AMM 49-11-00