What was found
AFTER TAKEOFF HEARD LOUD BANG AND PRONOUNCED BURNT RUBBER SMELL IN PERMEATE FLIGHT DECK, SUSPECTED BLOWN TIRE. LOWERED GEAR AND RETURNED FOR LANDING. INSP NOSE GEAR, NOSE TIRES, AND NOSE STEERING, NOSE BRAKES, PACK COMPTS, CANS, FWD AVI COMPT ALL RACKS, CNT E AND E. NTF DURING INSP OF EXTERIOR INSP FOUND PNL AVB 7332-503 OPEN LEFT SIDE NR 2 ENG, INSP INSIDE PNL AREA, NO DEFECTS OR LOOSE ITEMS. A/C FAILED DK CHECK, NR 2 PNEUMATIC SYS. REMOVED AND REPLACED ALL THREE COALESCER BAGS. OPS CHECKED NOSE GEAR 10 TIMES, NO ABNORMAL SOUNDS NOTED AT THIS TIME. TIGHTENED UP LEAKS ON PACKS 1 & 3. REPLACED AFT CARGO GALLEY/LAV PRESS REG VALVE. OPS/LEAK CHECKS GOOD. PERFORMED SYSTEM 1, 2 & 3 DECAY CKS OK.