As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT AT APPROX 12,000 FEET TURNED ON ENG & WING ANTI-ICE. IMMEDIATELY NR 1 AIR SYS SHOWED A NR 1 ENG MANIFOLD FAILURE. NR 1 AIR SYS INDICATED RED & NR 1BLEED AIR INDICATED CLOSED. WITH NR 1THROTTLE IDLE, NR 1 AIR SYS REMAINED RED UNTIL TAXI TO GATE. THERE WERE NO LEVEL 2 OR LEVEL 3 ALERTS DURING FLIGHT. R & R NR 1 PRESS REGULATOR VLV IAW AMM 36-12-01-4. OPERATIONS & LEAK CHECKED GOOD.