What was found
LOUD HIGH PITCH NOISE IN AFT GALLEY. SOURCE SEEMS TO BE AFT OF G ALLY BEHIND OVEN 711 AREA. CREW TRIED SHUTTING DOWN CHILLERS & OVENS, NO HELP. CREW STATED THE NOISE APPEARED TO BE COMING FROM AFT OF OVENS. INSPECTED GALLEY EQUIP & AREA ABOVE IN OPERATION & DIFFERENT AIR SETTINGS. NO NOISE PRESENT. EXCESSIVE CABIN PRESSURE LEAKAGE TEST PERFORMED IAW AMM 05-51-24-782-001. FOUND ON AFT PRESSURE BULKHEAD, RT RUDDER CABLE PRESSURE SEAL BOSS CRACKED. NUT IS CONTACTING MOUNTING BLOCK WITH A BEND IN FLANGE. OTBD TUBE FLANGE ON RUDDER CONTROL CABLES SHOULD MEASURE .82, MEASURES .45 RUDDER CONTROL CABLE AIR SEAL RA REMOVED IAW AMM 20-10-04-401 IAW ECRA 5310-08346 STEP 2. RUDDER CONTROL CABLE RB DISCONNECTED AT TURNBUCKLE AFT OF AFT PRESS BLKHD IAW AMM 20-10-03-004-002. RUDDER CONTROL CABLE RB FLANGE TUBE ASSY INSTALLED INTO AFT BLKHD MOUNTING BLOCK IAW ECRA 5310-08346A STEP 5. RUDDER CONTROL CABLE RA DISCONNECTED AT TURNBUCKLE, CABIN PRESSURISED TO CHECK FOR LEAKS IN AFT PRESS BLKHD TUBE FLANGES & AIR SEALS IAW AMM 05-51-24-782-001. NO LEAKS. CABIN LEAK RATE CHECK ACCOMPLISHED WITHIN LIMITS.