As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE ANTI-ICE COWL VALVE OPEN, LIGHT ON WHEN ANTI-ICE SWITCH IS OFF. ACFT GROUNDED. REPLACED NR 1 ENGINE COWL TAI VALVE REF MM 30-21-11-000-801 AND 30-21-11-400-801. PERFORMED OPS TEST, REF MM 30-21-00-710-801, OPS CHECKS NORMAL. ETOPS GROUND VERIFICATION TEST PASS SUCCESSFUL, REF MM 30-21-00.