As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE ANTI-ICE VALVE STUCK CLOSED, RAN QRH EXERCISED SWITCH BECAME INTERMITTENT. ACFT GROUNDED. PERFORMED FIM TASK 30-21-00-810-805 AND FOUND VALVE TO BE INTERMITTENT. REMOVED LT ENGINE COWL TAI VALVE REF MM 30-21-11. INSTALLED LT ENG COWL TAI VALVE REF AMM 30-21-400-801. PERFORMED 3RD TORQUE OF COUPLINGS. PERFORMED ENG COWL ANTI-ICING, OPS TEST. REF AMM 30-21-00-710-801 OPS TEST GOOD.