TC reported FDT undercarriage noisy withvibration. Also there was a APS fault, fault self clear whe n train depart ORC1. Staff (AMK) checked and confirmed FDT u ndercarriage noisy ~~~~~ 3654 TC reported undercarriage noisy with vibration. Also there was a APS fault. Fault self clear when train depart ORC1. Staff (AMK)checked and confirmed FDT undercarriage noisy. CE reported and suspect 3654 underframe noise coming from undercarriage near A2 door( From Twin tower). MR pressure between 9-10 bar.  3654 checked & found noise coming from A/c 1-2 compressor. Checked wheel flange & dump v/v - OK, no other abnormalities. Notif 2397996 raised to RSW to replace CCU.  Sarma 44750 Name                          : SARMA Date of Occurrence            : 08/07/2022 Last Service Date             :   EMU / Equipment / Location    : 3654/ A/C / 1 (1-2) Equipment Serial No. (if any) :   Description of fault / cause  : AIR CON 1-2 COMP NOISY Measurements (if any)         :      Required Rectification        : Required Servicing