As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SWITCHING NR 1 ENGINE ANTI-ICE SWITCH TO OFF, 10 MINUTES LATER COWL ANTI-ICE LIGHT ILLUMINATED DIM AFTER SELECTING SWITCH BACK TO OFF. ACFT GROUNDED. FOUND THE NR 1 TAI VALVE CONNECTOR PLUG VERY LOOSE. REMOVED AND INSPECTED THE CONNECTOR AND RECEPTACLE, NO DEFECTS NOTED. REINSTALLED THE CONNECTOR PLUG, OPS CHECKED GOOD IAW OPS TEST IAW AMM 30-21-00. CYCLED VALVE NUMEROUS TIMES WITH NO FAILURE.