As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR WOULD NOT FULLY OPEN WHEN WE ARRIVE AT THE GATE. GROUNDED - YES. FOUND UPPER GUIDE ARM PIN AND BROKEN SCREW, REPLACED UPPER GUIDE ARM PIN, SCREW AND WASHER PER B737-800 AMM 52-11-21 STEP G (4)MAIN CABIN DOOR (L-1)OPS CK NORMAL.