During DT-Found #2549 end 2 having heavy ~~~~~ 2549 end 2 having heavy air leak - During DT.  2549 A4 parking brake breather found slight air seepage. Operated parking brake button & air seepage stopped. Notif 2193108 raised to RSW to follow-up.  Chan SW 44069 Name:Chan(Team Sup 2/RSD/UPD) Date of Occurrence:25/08/2020 Last Service Date:Nil EMU / Equipment / Location:549/550 / Parking Brake / #2549 B4 Equipment Serial No. (if any):Nil Description of fault / cause: Heavy Intermittent Air Leak when                                 Brake at B3 and EM