What was found
AT FL350 WHEN WING ANTI-ICE WAS TURNED ON THE NR 1 PNEU PRESSURE WENT TO FULL SCALE AND BOTH WING ANTI-ICE DISAGREE LIGHTS CAME ON. THE CONFIG WAS NR 1 AND NR 2 PNEU SUPPLIES OPEN 1-3 ISO VALVE OPEN, 1-2 CLOSED AND NR 1 PACK ON. NR 3 PNEU SUPPLY WAS DEFERRED PRIOR TO FLT. ACCOMP CHECK OF NR 1 PSC, NO FAULTS NOTED. FOUND RT OUTBOARD FAULT INDICATOR LOGGED ON PNEU MANIFOLD FAULT INDICATOR. CHECKED WING ANTI -ICE DUCTING AND FOUND RT NR 5 TO NR 6 RETAINER FOR INTERCONNECT JOINT DAMAGED AND INTERCONNECT JOINT NOT CONNECTED TO OUTBOARD ANTI-ICE DUCT. REMOVED AND REPLACED RETAINER AND PERI SEALS FOR INTERCONNECT DUCT. LEAK CHECK NORMAL. RAN NR 1 AND NR 3 ENGS. ALL READINGS NORMAL.