As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FO WINDOW DIFFICULT TO OPEN AND CLOSE. GROUNDED - YES. PERFORMED INSPECTION OF FO SIDE WINDOW AND FOUND BOTH BELLCRANK ROLLERS SET SCREWS BACKED OUT APPLY LOCKTITE ON BOTH SET SCREWS AND RETIGHTENED AND APPLY TORQUE SEAL. REF B737-900 AMM TASK 56-12-11-820-801, OPS CHECK GOOD.