TC reported TIMS showed intermittent BCUfault at rear M2 car. ~~~~~ #2669 & #1669 both ACU having heavy hunting sound and leaking badly when B1 to coast. Replaced both ACU and function test brake status ok. #1669-ACU-New s/n: 1523-114  Old s/n: 1516-100 Not: 2124859    #2669-ACU-New s/n: 1511-092  Old s/n: 1442-036 Not: 2124857 Done by Kamal. 27/01/20.