505/506 Air leak test fail 1.0b/5min during DT check. ~~~~~ 505/506 Air leak test fail 1.0b/5min during DT check.  Check and found#2506 L/V rod lock nut loosen. This cause heavy leaking, after adjust car height within criteria, no more leak. Check leak test 0.6 bar for 5mins. Done by: Sateesh, Alauddin, Firdaus. 21/07/2024.