As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE TVBC AIR SHUTOFF VALVE HAS PIN DEPRESSED. TOOK OFF COVER AND FOUND PART OF SCREW IN VALVE NEED TO REPLACE VALVE. REF IPC 75-25-00A-003 PCN 645-1814. REMOVED & PARTIALLY INSTALLED TCVB VALVE NR 1 ENGINE PER MM. CONTINUED INSTALLATION OF VALVE THRU STEP G 8 PAGE 411 AMM 75-25-01 TO END OPS GOOD.