As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR NOISE REPORTED, LT SIDE FWD OF DOOR 3L. SEE THIS AND CHECK POSITIVE PRESS RELIEF VALVES. LOCAL MECH REPORTS APU PNEUMATIC DUCT LEAKING AT CLAMP LOCATED AT STA 1410 (AFT PIT-LT SIDEWALL). ADJUSTING CLAMP MOVES LEAK TO DIFFERENT POSITION. NEEDS NEW CLAMP. COMPLIED WITH MEL.-INF- :REF IPC36-11-01-020 ITM 75 PCN 170-0208. PIT SIDEWALL MARKED WITH TAPE FOR CLAMP LOCATION. REPLACED APU DUCT ASSY IN AFT PIT.