What was found
WING (L VALVE) LIGHT ILLUMINATED AND STAYED ON AFTER WING AINTI ICE WAS TURNED ON. GROUNDED - YES. PERFORMED LEFT WING THERMAL ANTI ICE VALVE HEALTH CHECK REF. AMM TASK 30-11-11-200-801. USED ALT DEAC. PROCEDURES FOR LE DEACTIVATION. REF. MPM 5-07-01 ITEM #3 OF TABLE 3.PULLED AND TAG TOTAL OF 2 C/B. RESET TOTAL OF 2 C/B AFTER MAINT PROCEDURE. OPERATED WIAV AS PER PROCEDURE, TEST PASSED. LEFT WTAI VALVE FUNCTIONAL TEST GOOD PER TASK 30-11-11-200-801.ALTERNATE DEACTIVATION PROCEDURES REVERSED ALL TAGS REMOVED.