What was found
AIR TURN BACK. DURING CLIMB ( 14000-16000) A LOUD BANGING SOUND STARTED. WE WERE AT ( 280-290 KTS). SLOWED SOUND STOPPED. AROUND 250 KTS FO'S WINDSHIELD WIPER WAS VIBRATING OPERATED WINDSHIELD WIPERS IAW AMM 30-42-00-5. WINDSHIELD WIPERS OPERATED NORMALLY AND TENSION WAS CORRECT ON FIRST OFFICER'S ARM. IAW CREW DEBRIEF THEY WERE NOT CERTAIN WHERE THE BANGING NOISE WAS COMING FROM BUT THOUGHT BETWEEN F/O AND CAPT'S WINDOW IS WHERE THEY BELIEVED IT WAS COMING FROM. NOTHING APPARENT FROM EXTERNAL VISUAL INSPECTION AT NOSE OF THE AIRCAFT. PERFORMED GVI OF RADOME AND ATTACHING HARDWARE AS WELL AS WINDSHIELD RETAINERS AND HARDWARE. PERFORMED OPS CHECK OF WINDSHIELD WIPER SYSTEM REF B767 AMM 30-42-00-5 WITH NO DEFECTS NOTED AT THIS TIME. PERFORMED GVI OF NOSE WHEEL WELL, MAIN EQUIPMENT CENTER AND COCKPIT AREA INTERIOR AND WINDOWS WITH NO DEFECTS NOTED. PER OPENED RADOME AND INSEPCTED FLIR COMPONENTS AND ALL ASSOCIATED HARDWARE AND CONNECTIONS, AND RADAR SYSTEM WITH NO DEFECTS NOTED INSPECTION CHECK OF RADOME REF B767 AMM 53-12-01-6. PER MOCC REQUEST INSPECTED L1 DOOR SEAL AND ASSOCIATED COMPONENTS WITH NO DEFECTS NOTED. PRESSURIZED A/C AND OPERATED PACKS WITH NO ABNORMAL SOUNDS OR INDICATIONS, REF B767 AMM 21-31-00-5. COULD NOT DUPLICATE DISCREPANCY.