What was found
PDIS: ENROUTE AFW-LAX WITHIN 10 SECONDS AFTER TURNING WING ANTI-ICE ON, RECEIVED LEVEL 3 AIR MANIFOLD 1 FAILURE. DIVERT TO BOI. CHECKED MANIFOLD FAIL INDICATION PANEL IN CAC FOUND PRESS SWITCH FAULT BALL SET FOR LEFT WING. RESET FAULT INDICATION PANEL. PERFORMED DECAY CHECK ON NR 1 MANIFOLD PER MM. TEST OK. INSPECTED SLATS FOR LEAKS WITH PRESSURE APPLIED. FOUND LT WING ANTI ICE VLV O/B CLAMP LEAKING. REPOSITIONED CLAMP AND RESECURED. LEAK CK NORMAL. MEL WING ANTI ICE AS PRECAUTION. LAX/29 REACTIVATED WAI. FUNCTIONAL CHECK NORMAL.