What was found
R1 DOOR DIFFICULT TO CLOSE/WON'T CLOSE FROM INSIDE. UPPER AND LOWER AFT ROLLER GUIDES HAVE GALLING AND METAL SHAVINGS. UPPER AND LOWER AFT ROLLERS ALSO HAVE METAL SHAVINGS. UPPER IS MORE DAMAGED. DOOR CLOSES WITH NO ISSUE FROM OUTSIDE. GROUNDED - YES. REMOVED AND REPLACED UPPER AND LOWER R1 DOOR AFT LATCH ROLLERS IAW B737-800 AMM 52-11-00-820-801. ADJUSTMENT CHECK PERFORMED IAW B737-800 AMM 52-11-00-820-801. ADJUSTMENT CHECK GOOD.