What was found
VENT EXTRACT FAULT, WITH CORRELATED FAULT ISOL V 24HQ WHEN EXTRACT PB/SW SET TO OVRD. REMOVED AND REPLACED AVIONICS VENTILATION SKIN EXCHANGER ISOLATION VALVE. REF AMM TASK 21-26-55-000-002-A. OPS CHECK PERFORMED IN REF TO AMM TASK 21-26-00-710-001-A. OPS CHECK GOOD.PARTS USED: 31-2125-9-9002,QTY :1 40-0597-3-0410,QTY :1 1419649,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1419649 SN OFF 3299 IPC REFERENCE # AIPC 21-26-01-17 VALVE, PNEU BUT OFF 31-2125-9-9002 3299 ON 31-2125-9-9002 5509