521/522-DT CHECK FOUND AIR LEAK FAILED 0 ~~~~~ 521/522 - DT CHECK FOUND AIR LEAK FAILED 0.75 BAR/5 MIN.  3521 3521 A2/B3, #2521 A4 & #3522 B4 door manifold found air leakage. Replaced the above mentioned door manifolds. Checked/found no air leakage from the door manifolds. Air leak test = 0.45 bar/5 min.  Alan/Lee PT 44286