As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 350 WITH ENG & WING ANTI-ICE ON, RECEIVED A LEVEL 3 AIR MANIFOLD 1 FAIL. ALERT GONE AT APPROX 15,000'. USED THROTTLE 1 FOR APPROACH & LANDING & ALERT DID NOT RETURN. REPLACED LT NR 1 MANIFOLD PRESS SWITCH IAW AMM 36-23-03-4. NO LEAKS NOTED.