As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT VALVE ANNUNCIATOR ILLUMINATED WHEN WING ANTI-ICE SELECTED ON (STAYED ON AFTER 10 SEC.). GROUNDED - YES. ACCOMPLISHED TASK B737-9 AMM 30-11-11-710-801; WING THERMAL ICE VALVES R AND L OPERATE NORMALLY - 5 TIMES. PULLED AND RESET TWO C/B'S 1AND 2 START VALVES.