As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 MANIFOLD FAIL LIGHT ILLUMINATED SHORTLY AFTER TURNING ON WING ANTI ICE. RAN RED TABS; FAULT LIGHT WENT OUT IMMEDIATELY. AFTER TURNING OFF NR 3 ENG PNEU SUPPLY SELECTOR. CHECK RT WING ANTI-ICE DUCTING FOR LEAKS NO LEAKS NOTED. CHECKED MANIFOLD FAIL DETECTOR CONTROLLER FOR FAULTS. FOUND FAULT BALL FOR RT WING PRESSURE SWITCH. REPLACED PRESSURE SWITCH IAW AMM 36-23-03-4. RAN ENGINE AGAIN WITH WING ANTI-ICE. NO LEAKS NOTED AND FAULT DID NOT RETURN. OPS CHECK GOOD.