As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT CREW REPORTED THAT THE LEFT HAND FLIGHT DECK SLIDING WINDOW OPEN AND WILL NOT CLOSE. MAINTENANCE FOUND THE RELEASE BUTTON STUCK AND LUBRICATED THE RELEASE/ LOCKING MECHANISM PER AMM 56-12-11. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.