As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT "COWL VALVE OPEN" REMAINED ILLUMINATED AFTER SWITCH MOVED TO OFF POSITION. GROUNDED - YES. REMOVED AND REPLACED NR 1 ENGINE ANTI-ICE VALVE REF AMM 30-21-11. PERFORMED SATISFACTORY OPS/ LEAK CK OF NR 1 ANTI-ICE VALVE USING THE ENGINE BLEED METHOD REF AMM 71-00-00. LEFT ANTI-ICE VALVE OK FOR SERVICE.