What was found
AIR SYS 3 OFF ALERT RAN QRH THEN MANIFOLD FAIL ALERT DIVERT KMCI. PERFORMED SATISFACTORY PNEUMATIC SYSTEM PRESSURE DECAY TEST WITH APU REF AMM 36-00-01-5. ON MCDU AIU 1 SHOWS CURRENT FAULT 314212 "NO LOOP 3 INPUT RCVD DURING MANF PREFLT TST-P". ON FRONT OF MANIFOLD FAILURE DETECTION CONTROLLER, RT WING PRESSURE SWITCH FAULT BALL IS DISPLAYED. REF FIM. BEFORE CHANGING SWITCH RAN PNEUMATIC SYSTEM 3 AND PERFORMED A PRESSURE DECAY CHECK PER AMM 36-00-01-5. ALL CHECKS PASSED. CHECKED FOR LEAKS ON LEADING EDGE AND FOUND NO LEAKS INDICATED. CHECKED MANIFOLD FAILURE CONTROLLER AND FOUND RT WING PRESSURE SWITCH FAULT BALL ILLUMINATED. CLEARED FAULT. REMOVED AND REPLACED MANIFOLD FAILURE DETECTION PRESSURE SWITCH S1-650 PER AMM 36-23-03-4. PERFORMED MANIFOLD FAILURE ADJUSTMENT TESTED PER AMM 36-23-01-5-1 AND NO FAULTS. SUPPLIED PRESSURE TO NR 3 PNEU SYSTEM AND TURNED ON WING ANTI-ICE. NO PRESSURE SWITCH FAULT ON CONTROLLER.