As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING NR 2 ENGINE IDLE RUN FOR ENGINE CHANGE, L WAI FAILED TEST WITH PNEUMATICS AVAILABLE AND WITHOUT PNEUMATICS AVAILABLE. MESSAGE READS WING ANTI-ICE VALVE LEFT IS FAILED IN CLOSED POSITION. MAINT MESSAGE CODE 30-10320. NO FAULT HISTORY & NO AMIS HISTORY. MSG IS LATCHED, T-S REF FIM 30-11 TASK 802. ACP'D WING ANTI-ICE GRND TEST WITH PNEUMATICS BUT STILL FAILS (2X). ORDERED WING ANTI-ICE VLV 646-9002. REPLACED LT WING ANTI ICE VALVE PER MM, OPS CHECK GOOD.