539/540 - DURING TRAIN PREP, TIMS DISPLA ~~~~~ To follow up.  2539 replaced BCP1 transducer. Function check & no brake fault on #2539. Performed brake pressure & brake cyclic test - OK.  Hanafi/Chan SW 44673 2539 DURING TRAIN PREP, TIMS DISPLAYED BCU FAULT.  2539 replaced ACU & transducer. Brake function test & found #2539 brake pressure reading intermittent with no variations. Due to time constraint, OPS 20 raised to follow-up.  Wong/Anand/Sarma 44672 #2539 ACU S/N : OLD : 1037/048 NEW : 1032/043