Train EB was applied at track circuit E778 in Auto mode with Obstructed Motion Detected. Released EB- ok. Proceeded in Auto mode to next station. ~~~~~ ER dowloaded. Found 1504 brake unable to release. Fault able to duplicate. Unable to duplicated when shunted in. Found intermittent fault. Checkd ACU found no leak. 2054 ACU + transmitter swapped to 1054. 1054 transmitter swapped to 2503. 2054 replaced ACU. Function test found SATIS. Depot shunting found SATIS. To be further monitored on ML. N.AKUMAR //12.09.21