What was found
LOUD BANGING NOISE FROM UNDERNEATH FLOOR OF FORWARD GALLEY DURING CLIMB OUT. CREW ALSO REPORTED THE NOISE WAS PERSISTENT DURING CLIMB AND STOPPED ONCE LEVELED OUT. DID NOT RETURN AGAIN DURING DESCENT. REMOVED FWD PIT CREW O2 BOTTLE ACCESS PANEL & FWD LAV TOILET BOWL SHROUD TO PERFORM VISUAL INSP FOR LOOSE LRU, NO ANOMALY OBSERVED. EE BAY GVI WAS ALSO PERFORMED, NO LOOSE LRU FOUND AT THIS TIME. PER TOMC, AIRCRAFT NEEDS TO BE PRESSURIZED TO CHECK FOR KNOCKING NOISE FOUND O2 PANEL AND FWD LAV TOILET SHROUD ALREADY RESECURED. PRESSURIZED CABIN TO 4PSI. NO UNUSUAL NOISE NOTED.