TC reported MR had dropped below 8 bar and LMRG fault illuminated. Fault self cleared when MR had ch arged up. ~~~~~ TC reported MR had dropped below 8 bar a Fault could not be duplicated from SEC ATSS records,contact braking/motoring command was trigged by CBTC due to braking at AMK1 from BSD TB1.MR subsequently able to reset.Performed preumatic checks ok.Further found car height slightly off. 0020 raised to check level v/v. Checked by Arthur/Ashwin. 14/12/22 To further check #1509 Bogie2 leveling valve. Readjusted car height of car #1509 with accordance to 6mc3. Side finding further check found #1509 bogie 2 levelling v/v slightly leaking.Replace new levelling v/v and tested ok. Levelling v/v:- Old s/n: 011328 New s/n: 1250716 Not: 2444355 Done by Koh/Sanip/Rizman. 14/12/22