511/512 both EMU MR drop rapidly when sa ~~~~~ 511/512 both EMU MR drop rapidly when saloon door remain open.  511/512 replaced door manifold at the following location : #3512 - A1/B1/B4 & #1512 - B1. Function check the replaced manifolds - OK. Air leak test - OK.  Kiran/Dinie/Abdillah/Farreze/Lee KH 44280 Door Manifold S/N :   OLD               NEW #3512 A1 :      10210             13118 #3512 B1 :      10162             13122 #3512 B4 :      10167             13138    #1512 B1 :      10197             13121 To follow up rectify.  1512 A1 door manifold v/v replaced. Security/function test - OK. Air leak test - OK.  Chan GF 44281 To continue rectification.  511/512 checked all cars pneumatic system for any air leak from side/underframe equipments & air pipings. Found #2512 brake frame BC test point leaking badly. Replaced with a new test point. Air leak test with doors opened - 5 mins/0.5 bar. Doors closed - 5 min/0.5 bar.  Chan GF/Alan 44284 To further rectify.  511/512 replaced door manifolds v/v at the following locations : #1512 - A3/A4/B2, #2513 - B3, #2511 - B2/B3/B4/A3, #1511 - A1/A3/A4/B2/B3 & #3511 - A1/B2. Door manifold v/v & door actuator air leak check - OK. All doors function test - OK. Air leak test failed door. Doors Opened -  2 min 40 sec, leak 1 bar. Door closed - 5 min, leak at 0.8 bar. OPS 40 raised to follow-up.  Chan GF/Alan/Shafie/Ridzuan/Aminur 44282