What was found
ON MAINTENANCE PREFLIGHT, NOTICED NR 1 ENGINE AND WING CONTROL ANTI ICE CIRCUIT BREAKER TRIPPED, RESET AND TRIPPED AGAIN WHEN WING ANTI-ICE SELECTED ON. ACFT GROUNDED. DISCONNECTED LT WING THERMAL ANTI-ICE VALVE CONNECTOR. OPS CHECKED VALVE & CIRCUIT BREAKER OPENS. DISCONNECTED LT ENGINE WING THERMAL ANTI-ICE SOLENOID CONNECTOR. CIRCUIT BREAKER REMAINS CLOSED. RECONNECTED LT WING THERMAL ANTI ICE VALVE. CIRCUIT BREAKER REMAINS IN. CLEANED LT WING THERMAL ANTI-ICE SOLENOID CONNECTORS & RECONNECTED. LT WING THERMAL ANTI-ICE OPS CHECKS GOOD. CIRCUIT BREAKER REMAINS IN. ENG NR 1 AND WING THERMAL ANTI-ICE VALVE CIRCUIT BREAKER STAYS IN DURING OPS CHECK. IW AMM 30-11-11-710-801 & 30-11-12-710-801.