As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
USED WING ANTI-ICE ON ARRIVAL UP IN 20-30K ALTITUDE. SWITCH ON L VALVE AMBER LIGHT ON. GROUNDED - YES. NO HISTORY 60 DAYS. C/W TASK 30-11-200-801 LEFT WING ANTIICE HEALTH CHECK. OPS CHK GOOD, COULD NOT RECREATE ZASABNO LATCH, AUDT MEESAGE OK. SAVID.