What was found
25 MINUTES INTO FLIGHT, FL 280 ENGINE ANTI-ICE ON, WING TAIL OFF, LEVEL 3 AIR MANIFOLD 2 FAIL. QRH PROCEDURE FOLLOWED. REMOVED AND REPLACED C5-87 CONNECTOR IAW EA1-3622-T0314946 REV PS P2. PERFORMED TEST OF THE MANIFOLD FAILURE CONTROLLER AND PASSED IAW AMM 36-23-01-5. RAN ALL ENGINES IAW JRH. ALL PNUMATIC SYSTEMS NORMAL AND NO ALERT ILLUMINATED. PNEUMATIC SYSTEM OPS AND MANIFOLD FAIL DETECTION OPS CHECKED OK IAW AMM 36-10-00-2 & 36-23-00-5.