What was found
DURING CLIMB OUT FROM DEN TURNED ON ENGINE ANTI-ISE. #2 ENGINE COWL VALVE OPEN LIGHT REMAINED BRIGHT BLUE AND AMBER TAI ILLUMINATED OVER #2 N1 GAUGE. GROUNDED - YES. DEFECT HAS HISTORY IN THE LAST 10 DAYS. SEAMC AND DISPATCH REJECT DEFERRAL. USED ALTERNATE DEACTIVATION PROCEDURES. REVERSED ALTERNATE PROCEDURES. (89313) 08/12/2023. REMOVED ENG & WING ANTI-ICE PNL P5-11. ACCOMP WIRE CHECKS, CKS GOOD. REINST. P5-11 PNC VERIFIED 28 VDC AT ENG #2 TAI VLV REF FIM 30-21 TASK 805 (80780) 08/12/2023. #1 AND #2 ENG FAN COWLS AND THRUST REVERSERS OPENED REF AMM 71-11-02 AND 78-31-00 TO FOM. REMOVED AND REPLACED #2 ENG TAI VALVE REF AMM 30-11-41. OPS TEST GOOD. PERFORMED ENG AND WING TAI PANEL (P5-11) TEST REF AMM 30-11-41. OPS TEST GOOD. CLOSED #1 ENG AND #2 ENG FAN COWLS AND THRUST REVERSERS REF AMM 71-11-02 AND 78-31-00.