As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE: N/A SMOKE IN COCKPIT - ATB. A/C LANDED WITHOUT INCIDENT. T/S IN PROGRESS. REMOVED AND REPLACED THE A SYS AIR PRESSURE REGULATOR IAW MM 2912. FOUND EVIDENCE OF HYD FLUID IN THE RES AIR PRESS CHECK VALVE ASSY. REMOVED AND REPLACED ALL 3 CHECK VALVES PERFORMED LK CHECK AND RAN ALL 3 ENGINES APPROX 10 MINS 2 PACKS ON NO DEFECTS FOUND.