As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SELECTING THE NR 1 ENGINE ANTI-ICE, COWL VALVE OPEN LIGHT REMAINED ILLUMINATED BRIGHT BLUE, AMBER TAI ILLUMINATED ON ENGINE INSTRUMENTS. APPROXIMATELY 5 MINUTES LATER, THE LIGHTS EXTINGUISHED AND EAI OPERATED NORMALLY. ACFT GROUNDED. REMOVED THE NR 1 ENG COWL TAI VALVE IAW AMM 30-21-11-000-801, INSTALLED SERVICEABLE COWL TAI VALVE IAW AMM 30-21-11-400-801. BONDING CHECK AND RESISTANCE 0.004, WITHIN LIMITS IAW AMM 30-21-11. OPS AND LEAK CHECKED GOOD.