What was found
2 MIN AFTER TAKEOFF, HEARD A LOUD POP ON FO'S SIDE FOLLOWED BY PUSHER SYS FAIL, NR 2 PITOT HEAT AND NR 2 ENG ADPT. CAUTION LIGHTS. SPEED CUE LOST ON CA. AND F/O'S SIDE FAIL, NR 2 ENG HEATER FAILED, WINDOW HEAT C/B POPPED. RETURNED TO FIELD, LANDED 61,800 LBS. (UNDER MAX LANDING WT). REPLACED NR1 HPSOV, NR 2 PITOT/STATIC TUBE, NR 2 AOA TRANSDUCER, NAD TMU. FOUND BURNED WIRING UNDER FLOORBOARD 133 AZ. REPAIRED WIRING. ALL OPS AND FUNCTIONAL CHECKS. C/W. ACFT OK FOR CONTINUED SERVICE.