What was found
AVNCS VENT INOP ON STATUS PAGE AVEC TEST HITS SKIN AIR OUTLET VALVE HAS HISTORY OK TO MEL DEFERRED PER MEL 2126C, DDP STEP A,B, & D C/W BY U092844 & U102066, PROCEDURE 2 PRIOR TO DEICING. REPLACED 22HQ SKIN AIR OULET VALVE IAW AMM 21-26-53-400-001-A. 21-26-00-710-001-A. AEVC SYSTEM TEST PASSED. NO FAULTS NOTED. ACP REACTIVATION OF SKIN AIR VALVE OUTLET IAW ROTABLE PARTS CHANGE WAS INDICATED .