As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD PRESSURE LEAK AT CAPTAIN'S LEFT SLIDING WINDOW. SUSPECTED LEAK AREA MARKED WITH TAPE. SQUEAL STARTED AT VERY LOW CBN DIFF PRESSURE AND CONTINUED UP TO CRZ DIFF PRESSURE OF 8.6. PRESSING ANYWHERE ON THE WINDOW DID NOT MAKE ANY DIFFERENCE. REPLACED & ADJUSTED WINDOW.