As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DOOR 1L DIFFICULT TO OPEN FROM OUTSIDE. MULTIPLE ATTEMPTS MADE BEFORE DOOR OPENED NORMALLY. MAINTENANCE CLEANED AND LUBRICATED 1L DOOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 52-10-00 AND 52-11-00.