TC reported intermittent rear M1 car BCUfault. Brake status check ok. Train performance ok. ~~~~~ #1501 Tims code 308, 312, 330, 331 (BCU release fault). Replaced ACU and function tested ok. ACU- Old s/n: 9929-018.  New s/n: 1037-046. Not: 21259381 raised to RSW. Done by Samsudin/Pravin.  11/05/20.