As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, APPROACH AND AFTER ENGINE SHUTDOWN, THE LEFT COWL VALVE OPEN LIGHT FLASHED ON AND OFF INTERMITTENTLY. TAI DID NOT DISPLAY WITH BLUE CALL LIGHT. ACFT GROUNDED. PERFORMED FIM 30-21 / 806 INITIAL EVALUATION. OPS CHECKED GOOD. DUE TO HISTORY, REMOVED AND REPLACED THE NR 1 ENGINE COWL TAI VALVE IAW AMM 30-21-11.