As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE RT COWL VALVE OPEN BLUE LIGHT FLICKERING WITH ENG ANTI ICE SWITCH OFF. WHEN ENG ANTI ICE SWITCH SELECTED ON BRIGHT BLUE COWL OPEN LIGHT ILLUMINATED. LIGHT BRIGHT BLUE IN DESCENT REGARDLESS OF SWITCH POSITION. GROUNDED - YES. PERFORMED FIM 30-21 TASK 804, CONNECTOR DP1303 REMOVED CLEANED REINSTALLED TAI VALVE RIGHT SIDE OPS NRML.