As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS 4L DOOR EXTREMELY HARD TO OPEN AND CLOSE. APPEARS OUT OF ALIGNMENT AS GIRT BAR COVER CATCHES ON THE FLOOR WHEN CLOSING. MAINTENANCE REPLACED THE LT AFT DOOR GUIDE ARM IAW AMM 52-13-21. OPS CHECK GOOD.