As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXTREMELY LOUD NOISE FROM CAPT'S SLIDING WINDOW COULDN'T HEAR RADIO'S OR F/O AT APPROX 9000 FT. ABORTED FLIGHT AND RETURNED TO SFS. REMOVED AND REPLACED LT SLIDING WINDOW SEAL AIRFRAME SIDE PER IPC 56-12-10-01 ITEM 470. PRESSURIZATION FOR LEAK CHECK PER MM 21-00-00-2, NO LEAK FOUND. A/C OK FOR SERVICE.