What was found
AFTER TAKE OFF WITH AIR MANUAL AND ICING ANTICIPATED, ENGINE & WING ANTI-ICE WAS ON & ARMED. WHEN THE WING ANTI-ICE VALVE ATTEMPTED TO OPEN LEVEL 2 WING ANTI-ICE DISAGREE ILLUMINATED. NO LONGER IN ICING CONDITIONS, DESELECTED WING ANTI-ICE AND ALERT EXTINGUISHED. BACK INTO ICING CONDITIONS AND SAME SCENARIO RESULTED. THIS TIME NOTICED NR 3 BLEED CLOSED AND OPENED IT THINKING THAT WAS PROBLEM, WHICH WAS FOLLOWED BY LEVEL 3 AIR MANIFOLD 3 FAIL WHICH IMMEDIATELY EXTINGUISHED WHEN NR 3 BLEED WAS CLOSED. DESELECTED WING ANTI-ICE AND NR 3 BLEED RETURNED TO NORMAL OPEN.NO FURTHER ALERTS. PSC-1 AND 2 SHOWED BOTH RT WING MANIFOLD FAIL LAST FLIGHT LEG, ESC SHOWED RT WING ANTI-ICE MANIFOLD FAIL ON FL-17. FOUND HEAVY BLEED LEAK ON CLAMP UPSTREAM NR 3 FLOW CONTROL VALVE, REPOSITIONED THE CLAMP PROPERLY IAW MM 21-51-01-02. COMPLIED WITH THE NR 3 PNEUMATIC DECAY TEST, PASSED IAW MM 36-00-01-05.