As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT WITH ANTI ICE ON, L VALVE AMBER LIGHT REMAINED ILLUMINATED. GROUNDED - YES. INTERROGATED FAULT HISTORY. FOUND NO FAULTS. PREFORMED B737-9 FIM TASK 30-11-00-810-808 FOR WING ANTI-ICE STAYS ON AFTER TRANSITION. VALVE AND PANEL OPERATIONAL CHECK GOOD. TRANSITORY FAULT.