Chime continuously non-stop since BBT2.Unable to reset.evening peak. ~~~~~ 3510 Chime continuously non-stop since BBT2 Unable to reset. Train was scheduled withdrawal to UPD after evening peak.  3510 Confirmed chime activated non stop during open/close door. Checked chime relay - OK. Swap chime Amp. from 3510 to 3509. Fault transfer to 3509. No spare available to c/out. Raised OPS20 for changeout. Aliff/Redzwan 45296 Awaiting spare. Replaced new chime Amp.at 3509. Function tested-OK. Door close chime Amp.    old s/n:1004026 new s/n:2012001 Alan/Sugu 45296