DT545/546-UNDERSHOOT 545/546- UNDERSHOOT ETRIEVE ATS AND RS LOGS. NALYSE AND OBSERVE RS LOGS, NOTICE ABNORMAL BCP AT 3546 AND 1545. APPEN AT BOTH FAULT TIMING ARD 1728HRS AND 2000HRS ~~~~~ DT545/546-UNDERSHOOT     Check Tims no observed any FC-related fault.ER found #1546 abnormal BCP 1 & 2 fluncting.During in pit fault able to simulate BCP 1 &2 stuck at 2.9bar.Further check found BCP 2 transmitter adapter broken-replaced ok.But fault recure,try apply parking brake and release fault clear.Swap PBSV to #2546 and brake cyclic test observed #1546 BCP 1 & 2 intermittent slow release.Swap B13 v/v to #2546 and brake cyclic test ok.To be further monitoring in M/L. Done by Koh/Jack. 26/04/21