What was found
ON INITIAL CLIMB-OUT PASSING 2,500' LVL "AIR SYS 3 OFF" FOLLOWED BY LVL 2 "WING A-ICE R DISAG" AFTER TURNING WING ANTI-ICE ON. RECEIVED ICE DETECTED ALERT. RAN CHECKLIST DEPARTED ICING CONDITIONS, RETURNED ANC. REPLACED RT WING A/T VALVE PER MM 30-11-01-4. REMOVED AND REPLACED RT WING A/I DP SWITCH PER MM 30-11-02-4, LEAK AND OPS CHECKS NORMAL ON GROUND.