As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FO WINDOW HARD TO CLOSE. GROUNDED - YES. FOUND ROLLER ON FO'S SLIDING WINDOW AFT LOWER BELL CRANK HAS FALLEN OFF. REINSTALLED ROLLER PER AMM 56-12-11-820-801. COMPLETED OPS CHECK OF WINDOW PER AMM 56-12-11-710-803. CHECKED WINDOW HEAT PER AMM 30-41-00.