As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FIRST OFFICER'S SLIDING WINDOW (R2) FAILED OPERATIONAL TEST FROM OUTSIDE THE CONTROL CABIN (WINDOW DID NOT UNLOCK AND OPEN WHEN THE EXTERNAL RELEASE HANDLE WAS PULLED). THE EMERGENCY RELEASE MECHANISM WAS LUBRICATED AND THE AREA WAS CLEANED. A FUNCTIONAL CHECK WAS GOOD IAW AMM 56-12-11.