As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT F/O NOTICED R-2 WINDOW HANDLE WOULD NOT DISENGAGE LOCK AND WINDOW WAS DIFFICULT TO OPEN, AND THEN WOULD NOT FULLY CLOSE. GROUNDED - YES. REMOVED F/O'S SLIDING WINDOW IAW B737-900 AMM 56-12-11. REPLACED LOWER FWD BEARING AND BOLT, ORIGINAL SHIM STACK INSTALLED. REF AMM 56-12-11. REINSTALLED WINDOW REF AMM 56-12-11. NO ADJUSTMENTS MADE, ALL OPS CHECKS OK.