TC reported while changing end, rear M2car line flow fan noisy. ~~~~~ CHECKED RAD AND VENT SYSTEM OK.FOUNFD FAD NO 2 END B/S FLAP U BLE TO CLOSE INTERMITTENT.C/O NEW FAD FUNCTION TEST OK.JIMMY/RAGHU 19.09.2022 NEW S/N 848 OLD S/N 927 NOTIFICATION 2419237