As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 COWL VALVE OPEN LIGHT ILLUMINATED AND REMAINS BRIGHT BLUE WHEN TURNED ON AS WELL AS IAI LIGHT TURNS AMBER ALTERNATE DEACTIVATION PROCEDURES PER CHAPTER 5 TABLE 3 ITEMS 3&5. GROUNDED - YES. REMOVED & REPLACED # 2 ENG COWL TAI VALVE REF B737-800 AMM 30-21-11 OPS CHECK AND LEAK CHECK GOOD, REVERSED ALTERNATE PROCEDURES.