As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT + AT CRUISE EXTRELY LOUD RUSHING AIR SOUND ON FO SIDE REF PREVIOUS WRITE UPS, AIR RETURN PER MOC -`PERFORMED INSPECTION OF AVEC DUCTING PER AMM 21-26-00. NO DEFECTS NOTED. PRESSURIZED A/C TO INSPECT FOR LEAKS, PER AMM 21-31-00. NO LEAKS NOTED. REPLACED AVEC OUTFLOW VALVE PER AMM 21-26-53. OPS + LEAK CHECK NORMAL A/C OKAY FOR SERVICE.