What was found
(CAN) AT ROTATION, EXPERIENCED NOTICEABLE VIBRATION FROM THE THROTTLE QUADRANT ACCOMPANIED BY NOISE. UPON RAISING THE GEAR, LEADING EDGE ANNUNCIATOR FLICKERING AMBER/GREEN. THE FE REPORTS WING OVERHEAT AND ALSO NOTES LOW DUCT PRESSURE. S.I.C AND F.E BEGIN THE LOW PRESSURE (AROUND 3 PSI) DUCT PROCEDURE. CAPTAIN RETURN TO THE AIRPORT AND AN UNEVENTFUL LANDING OCCURRED. AFTER THE LEADING EDGE ANNUNCIATOR STABLE - OTHER FAILURES NOTED ENGINE NR 2 N1 INOP, COMPASS FLAGS, INS NR 2 UNSTABLE. AFTER VISUAL INSPECTION AND INVESTIGATION WE FOUND NR 4 BLEED DUCT (INBOARD ENGINE NR 2) BLOW OUT AND DUE TO THE BLAST, SOME WIRES WERE DAMAGED, NO EVIDENCE OF STRUCTURAL DAMAGE WERE FOUND. PARTS WAS REPLACED AND/OR REPAIRED AS REQUIRED. POSSIBLE CAUSE, ENGINE NR 2 OVER- PRESSURIZATION OF THE PNEUMATIC SYSTEM DUE TO A HIGH STAGE BLEED VALVE MALFUNCTION.