1546 Intermittent BCU fault, To rectify ~~~~~ #1546 ACU slow release when in coast position.Air leaking from exhaust port.Replaced ACU and carried out brake cyclic & function test-ok. ACU Old s/n: 1037-046  New s/n: 1311-148 Not: 2137568 raise to RSW. Done by Koh B.S. 04/03/20